Sunstopper Team 2.0 1/4 Zip Baselayer Our popular Sunstopper base layer is back and better than ever with updated styling and exciting new color blocking. Same great performance features but now with a raglan-cut sleeve for extra comfort and breathable tech mesh paneling in all the places you need it most. AriatTEK Heat Series technology keeps you cool when the competition heats up Moisture Movement Technologyâ„ keeps you drier Sun Protection Fabricâ„ with UPF rating of 45 provides protection from ultraviolet rays Fabric inhibits the growth of bacterical odors Lightweight pique knit Show collar with zip styling Breathable mesh paneling Team color blocking