The women's Burton Midweight Crew is made with DRYRIDE Ultrawick(TM) Midweight 200 fabric that's scientifically engineered to pull heat-robbing sweat away from your skin and propel it through your outer layers. You stay dry, warm, and stoked all day, and since its midweight you get versatile warmth that works all season. This midweight shirt comes stocked with added features including UPF 50+ protection against ultraviolet rays, four-way stretch for mobility, a Agion(R) Stink-Proof finish, and chafe-free seams for a friction-free ride. bluesign(R) Approved Product DRYRIDE Ultrawick(TM) Midweight 200 93% Polyester, 7% Spandex Fabric Quick-Drying and Highly Breathable Stretch 360deg for Unlimited Mobility Agion(R) Stink-Proof Finish Chafe-Free Softlock Seams for Comfort Thumbhole Cuffs Extra Long Body: Strap In Without Your Shirt Un-Tucking 1-Year Warranty HOW TO MEASURE CHEST Measure the fullest part of your chest, under your arms. NATURAL WAIST Measure around your natural waist. HIPS Measure around