TOUGHMESH(TM) FABRIC - Keep the Rays at Bay "I use mine every day the sun is out, and that&&';;s nearly every damn day here in sunny Florida. I love it when I am outside on the move with some weight on my back, that&&';;s my form of mental health, but I have no interest in even having a dermatologist, let alone being on their Christmas card list. You gotta keep the rays at bay and this is how I do just that." - Jason, GORUCK CoFounder Featherweight performance ToughMesh with UPF 30+ sun protection that breathes and wicks like crazy, dries with little to no breeze, and packs down to practically nothing. The fabric is world-class ToughMesh, milled in the foothills of the Italian Alps close to where da Vinci painted The Last Supper, and it&&';;s now proven with rucks on our backs all over the world. Features Built out of world-class, featherweight ToughMesh(TM) Small GORUCK spearhead on chest Off-the-shoulder seams for minimal friction when rucking Hood provides additional protection from the sun Specs + Materials Charcoal: 80% Nylon, 15% Elastane, 5% Polyester Black & Ranger Green: 85% Nylon, 15% Elastane About ToughMesh(TM): "Simplicity is the ultimate sophistication" - da Vinci. T&&';;s transition easily from the driveway to the streets to the bar. With and without a ruck on your back. ToughMesh(TM) weighs only 100GSM (grams per square meter). That&&';;s 30-40% less weight than normal performance fabrics. To make the fabric tough enough, we use nylon (then add a little stretch). The polyester version repeatedly failed our testing and cost us an extra year that we&&';;ll never get back. Every roll of fabric takes 6 hours to complete, using 44-gauge needles. Standard fabric takes 45 minutes and uses 20-gauge needles. Quality takes time. Mini-perforations are woven into the fabric to increase airflow, speed up dry time, and decrease weight. They&&';;re small and mighty but do not dominate the shirt&';s aesthetic. Antimicrobial treatment is added into the fibers themselves, before the fabric is woven in Italy. This process ensures a significantly longer lifespan of odor resistance across repeated washings. Lesser fabrics are simply "coated" after they&&';;re milled - which wears off in just a few cycles of a high-powered washing machine. UPF 35 (this provides 97%+ coverage) to protect your skin from the sun. Off-the-shoulder seams remove friction while wearing a ruck - which we hope you do often.