Start with the label you already own
Open your wardrobe and pick the three garments you reach for most, then the three you avoid. Read the fibre content on each inner label. Patterns appear quickly: favourites often share a fibre or a knit, while the avoided pieces frequently contain something that traps heat or scratches. That small exercise tells you more about your comfort than any trend report, and it costs nothing.
Fibre is only half the story. The same cotton can become a soft jersey tee, a crisp poplin shirt or a heavy denim. Knits, made from interlocking loops, stretch and recover; wovens, made from crossing threads, hold their shape but give less. Weight matters too. Fabric weight is often given in grams per square metre (gsm): a light summer tee may sit around 140 gsm, a sturdy everyday tee nearer 200, and a sweatshirt fleece well above 300.
Cotton: the dependable default
Cotton is breathable, absorbent and easy to wash, which is why it dominates everyday wear. Comfort varies with staple length — the length of individual fibres. Longer staples spin into smoother, stronger yarns that pill less. Supima is a licensed trademark for American-grown Pima cotton, and Egyptian Giza varieties are known for their extra-long staples. Initiatives such as Better Cotton focus on farming practices rather than feel, so treat them as a sourcing signal, not a softness promise.
Cotton’s weakness is moisture: it absorbs sweat and dries slowly, so a heavy cotton tee can feel clammy after exertion. For active days, lighter weights or blends help.
Linen, wool and the regenerated fibres
Linen comes from the flax plant and is prized for cool airflow on hot days. It creases readily and can feel stiff when new, but softens with every wash. The European Confederation of Flax and Hemp (CELC) runs the European Flax label for fibre grown in Western Europe.
Merino wool surprises many people who associate wool with itch. Prickle depends largely on fibre diameter, measured in microns; finer merino, often under about 19 microns, feels smooth to most skin. Merino regulates temperature and resists odour, so it can be worn more than once between washes. The Woolmark Company certifies wool products under its well-known logo.
Lyocell and modal are regenerated cellulose fibres made from wood pulp. Lenzing markets them as TENCEL. Both feel cool and silky, drape well and absorb moisture efficiently, which makes them pleasant in tees and underlayers.
Synthetics and stretch
Polyester dries fast and resists wrinkles but can trap heat and hold odour. A small proportion of elastane — invented at DuPont by chemist Joseph Shivers in 1958 and sold as LYCRA — adds stretch and recovery. Two to five percent in jeans or trousers often makes sitting easier; much more can feel compressive and may lose recovery with heat.