Material Guide

Material Guide

Explore our guide to learn more about the materials we love, and why we’ve chosen them for Filippa K pieces.

OUR NATURAL FIBRES
PLANT-BASED MATERIAL
Cotton + -

Cotton is a natural fibre that is derived from the cotton plant. We use it throughout our collections for its durability, breathability and ease of care – most commonly in wardrobe basics like denim and t-shirts.

Organic cotton 

Organic cotton is grown without the use of chemicals, pesticides, synthetic fertilisers, or GMO crops. Less than 1% of the cotton grown in the world is organic. We aim to increase our usage of organic cotton, but due to the limited global supply of this fibre we are not always able to source it in the necessary yarn sizes. 

Recycled cotton 

Recycled cotton is derived from the scraps of textile manufacturing processes, cuttings, and discarded garments, which are then processed to create recycled cotton fibres. These become shorter and weaker after recycling, so recycled cotton is often blended with a non-recycled fibre for strength. We like to use recycled cotton in more durable pieces like denim and outerwear.  

Linen + -

Linen comes from cellulose fibres in the stalk of the flax plant. Flax is a versatile crop, growing well in most types of soil regardless of quality.  

As a fabric, linen is durable, naturally moth resistant, and stays cool in warm temperatures. The loose structure of linen gives it a relaxed look and breathable feel. It holds colour well which provides it with a lustrous shine. We use linen in a variety of pieces throughout womenswear and menswear, especially in spring and summer collections. Its light weight makes it ideal for shirts, t-shirts and trousers. 

ANIMAL-BASED MATERIAL
Wool + -

Wool is a natural fibre that is obtained from sheep and other animals: cashmere and mohair come from goats, and alpaca is from animals in the camel family. Wool is best known for its warming properties when it’s cold, but it is also temperature-regulating to stay cool when it’s warm. This is due to the structure of wool fibres, which enables them to trap air and absorb moisture without becoming damp. Each type of wool has unique properties. We use wool in knitwear, outerwear, suits and trousers. 

Merino wool 

Merino wool comes from the fleece of merino sheep, a breed known for its fine and soft wool. These sheep are primarily raised in countries with suitable climates for merino farming, including Australia, New Zealand, South Africa, and certain regions in South America. Merino is one of the finest types of wool – it is finer and softer than regular wool, yet it has the same temperature-regulating qualities. It is high in quality and can be spun into fine wire threads that create a breathable material. We use merino in lighter knitwear pieces, and for suiting fabric. 

Recycled wool 

Recycled wool is not directly derived from sheep or goats. Instead, it is made from reclaimed or recycled wool fibres obtained from discarded woolen garments or textile waste in production. 

Swedish wool 

In 2019, we worked with a local farm and another Swedish brand to develop a new supply chain that sources local Swedish wool: a raw and natural material. Sweden’s sheep provide over 1000 tonnes of wool each year, most of which goes to waste. We visited the farm Norrby Gård to learn about how we can turn this into a resource. We’ve continued to develop this supply chain, scaling up the project to involve more brands and partners. Each year we aim to introduce a new garment made from Swedish wool.  

Learn more about Swedish wool

Mohair + -

Mohair comes from the fleece of the Angora goat and the fibre is known for its lustre and shine. We source our mohair primarily from South Africa. The fibre has a soft and lightweight feel, and it provides a unique fluffy textured appearance that sets it apart from other types of wool. Mohair fibers are strong, contributing to the durability and longevity of garments made from this material. We typically use mohair in knitwear.

Alpaca + -

Alpaca wool comes from the fleece of the alpaca, a domesticated South American camelid. Alpacas are primarily found in countries like Peru, Bolivia, and Ecuador. This type of wool is renowned for its softness and is often compared to cashmere or mohair. The silky fibres are long (10-20 cm) and fine, giving it a softer and more durable quality than sheep’s wool. Despite being lightweight, alpaca wool has good insulation properties that keep the wearer warm in colder temperatures. We use alpaca in knitwear thanks to its hypoallergenic qualities, shrink resistance, and lightweight feeling.  

Cashmere + -

Cashmere comes from the soft undercoat of cashmere goats, particularly breeds like the Kashmir goat. These goats are primarily found in regions of Central and South Asia. The fibre is renowned for its luxurious softness and is six times finer than human hair. Despite its lightweight nature, cashmere provides significant warmth which makes it a popular choice for winter clothing. Cashmere has natural breathability, allowing air to circulate while regulating temperature, providing comfort in various climates. However, it can be prone to pilling due to its natural properties. We use cashmere in our knitwear and outerwear fabric.

Yak + -

Yak wool is a luxurious fibre derived from the undercoat of the yak, found in the Himalayan regions of Central Asia. The wool they produce is valued for its warmth, breathability, and durability. Like other natural fibres, yak wool has natural breathability, allowing moisture to evaporate while maintaining a comfortable temperature. The fibre is also naturally hypoallergenic, making it a suitable choice for individuals with sensitive skin. We use yak wool in our knitwear. 

Silk + -

Silk is derived from the glands of silk-producing insects, particularly the silkworm. Silk fabric has a natural sheen that adds an elegant and glossy appearance to clothing. Although silk is a durable material, it is also sensitive to abrasion, light, perspiration and static. It is lightweight, soft to the touch and moisture-absorbing, which allows the wearer to feel cool in high temperatures and warm in low temperatures. When cared for properly, it can retain its qualities to last a long time. We use silk in woven pieces such as dresses, blouses, trousers and shorts. 

Down + -

Down comes from the soft underfeathers of ducks or geese. These are lightweight, fluffy, and have insulating properties – they create tiny air pockets that trap warm air, retaining the heat of the wearer. Down is incredibly resilient and can withstand being compacted many times without losing its loft or ability to fluff. Down also allows moisture to escape, contributing to breathability and helping regulate body temperature. We only design with two types of down: certified, which confirms animal welfare and that the down has not been plucked from live birds, and recycled down from post-consumer waste. We use down in our puffer jackets.

Leather + -

Leather comes from the processed and tanned raw hides of animals – most commonly cows, goats or lambs. The tanning process is essential as it preserves and strengthens the hides as well as making them more supple and pliable for a garment. Leather is highly durable and can withstand wear and tear, contributing to the longevity of clothing items. With proper treatment and wear, leather becomes more supple and comfortable over time, conforming to the shape of the wearer. We use it primarily in accessories such as bags and shoes, and occasionally in ready-to-wear pieces.   

All the leather we source is a byproduct of existing food production.  

Tanning 

Vegetable tanning is a process that utilises tannins extracted from plant sources, such as tree bark. This method imparts a more natural, earthy colour to the leather. Chrome tanning relies on the use of chromium salts for the tanning process. This method results in a softer and more supple leather. While chrome tanning can be faster and more cost-effective, it raises environmental concerns due to the use of chemicals. Balancing the desired qualities of leather with environmental considerations is crucial in choosing between these two tanning methods. We aim to only source from tanneries that are certified according to the “Leather Working Group” (LWG), which covers their environmental performance and chemical management.

OUR MANUFACTURED FIBRES
MANMADE CELLULOSIC MATERIAL
Viscose + -

Viscose, also known as rayon, is a man-made fibre derived from natural sources, primarily wood pulp. The production comes from various trees, including beech, pine, and eucalyptus. It’s a sensitive fabric that is comfortable to wear, easy to wash, and retains colour well over time, but it can be prone to shrinking if not cared for properly. Viscose is used throughout our collections in dresses, blouses, and mixed into fabric for suiting. We are proud to use LENZING™ ECOVERO™ by Lenzing AG as one of our viscose qualities. 

Lyocell + -

Lyocell is a man-made fibre derived from wood pulp, typically sourced from eucalyptus trees. It is comfortable to wear with a unique powdery texture and smooth feeling. It’s most commonly used in our jersey tees, dresses and men’s shirting. We are proud to use TENCEL™ Lyocell by Lenzing AG and TENCEL™ Lyocell with REFIBRA™ technology by Lenzing AG as some of our lyocell qualities. 

Modal + -

Modal is a man-made fibre derived from beechwood pulp. Its characteristics are similar to those of cotton, although modal is more resistant to pilling and more absorbent. It is often used as an alternative to, or blended with, silk or cotton. Modal will not shrink when it’s washed, and it retains colour very well. We use it in both jersey and woven products, and often in materials where it’s mixed with other fibres. We are proud to use TENCEL™ Modal by Lenzing AG in some of our products. 

Cupro + -

Cupro is a cellulose fibre made from cotton linter, which is a by-product of the cotton industry. The fine, silky fibres are produced using a closed-loop process. The material is soft to the touch with many functional properties: it controls moisture and stays breathable, making it warm to wear in the winter and cool in the summer. The consistency of the fibre can absorb dye well, meaning the colour stays vibrant for longer. We use cupro in the lining of some of our products such as suiting and outerwear. We also use it in woven pieces like dresses and shirting.

Acetate + -

Acetate is often considered as a semi-synthetic fibre, because it is made from cellulosic origins derived from wood pulp or cotton linters mixed with acetic acid. The wood pulp used in acetate production is typically sourced from fast-growing trees. Acetate is soft and delicate providing drape, flow, and a slight sheen to the styles that it is used in. It’s often mixed with other fibres for strength and durability. Acetate and triacetate are very similar: they are both semi-synthetic fibres with luxurious characteristics, but the distinction in their chemical structure leads to differences in properties. We use acetate in jersey styles like t-shirts and dresses. We are proud to NAIA™ acetate by Eastman in some products, which is made from certified pine, eucalyptus and recycled content. The production process is a closed loop, where solvents are recycled back into the system for re-use.

Triacetate + -

Triacetate is often considered a semi-synthetic fibre, because it is made from cellulosic origins derived from wood pulp or cotton linters mixed with acetic acid. Triacetate has a relaxed, flowy feeling and is a long-lasting and durable material that maintains its properties for years of wear. It resists shrinking and wrinkling (so it doesn’t need much ironing), dries quickly, is machine washable, and doesn’t pill or produce static. Acetate and triacetate are very similar: they are both semi-synthetic fibres with luxurious characteristics, but the distinction in their chemical structure leads to differences in properties such as wrinkle resistance. Triacetate is often chosen when enhanced wrinkle resistance is desired in clothing. We often blend triacetate with other fibres, and it can be found in our dresses, blouses, trousers and jackets.

SYNTHETIC MATERIAL
Polyamide + -

Polyamide, commonly known as nylon, is a synthetic polymer derived from oil. Nylon is known for its high strength and durability, making it a robust material for clothing. It can withstand wear and tear, making it suitable for activewear, hosiery, and outerwear. Nylon has moisture-wicking properties and dries quickly, making it suitable for activewear and outdoor clothing. We use polyamide for leggings and tops as well as in functional outerwear. 

Recycled polyamide 

Recycled polyamide is derived from used textiles, industrial waste, or other nylon products. The recycling process involves breaking down the existing polyamide into its raw form to create new fibres. 

Polyester + -

Polyester is a synthetic polymer derived from oil. The material is very durable, tear-proof and abrasion-resistant, though it can be prone to pilling. It is designed to absorb moisture but not retain it which makes it ideal for activewear garments. We use polyester for long-lasting outerwear pieces and blended with wool in knitted garments for increased durability. 

Recycled polyester 

Recycled polyester is currently derived from post-consumer PET (Polyethylene Terephthalate) plastic bottles or post-industrial waste. The process involves collecting, cleaning, and processing used plastic bottles into polyester fibres. These hold the same qualities as virgin fibres. There are no technologies at scale which can create recycled polyester from textile waste, but we continue to follow industry development while aiming to source from the textile value chain.

Elastane + -

Elastane, also known as spandex or Lycra, is a synthetic fibre derived from oil. The incorporation of elastane in clothing enhances comfort by allowing freedom of movement due to its elastic properties. We use elastane for performance benefits in our activewear, and in pieces like trousers, suits, and dresses where comfort stretch improves the garment and increases wearability. 

Today, clothing containing a high percentage of elastane is not recyclable as commercial technology to separate elastane from other fibres does not exist. We keep this in mind when we decide to add elastane to our garments, as we consider the end of life of our pieces during the design process.