PATAGONIA. 53060WHI. MAINSTAY 3 4-SLEEVED TOP. WHITE. Our lightest-weight top is no lightweight. A hard-working multifunctional pocket tee made with 60 percent organic cotton 40 percent polyester fabric blend provides the benefit of cotton with the added quick-dry performance of polyester. Longer three-quarter-length sleeves provide increased sun protection. Left-chest patch pocket stashes the small stuff. Hip length.