7mesh have engineered the s2s jersey to be lightweight but durable and able to perform in a variety of conditions a stretch woven nylon front is durable and protective while a knitted polyester back with mechanical stretch makes for a perfect fit and doesnt retain moisture so you remain comfy as you build up a sweat both fabrics are upf 50 for sun protection the more generous cut of this jersey makes it easy when layering up below but also gives you great freedom of movement when muscling y