HUKKryptek Performance Sleeve With the Huk Performance Sleeve, you don't have to worry if you have a short sleeve shirt on to get protection from the sun. The top-arm panel uses the same 30+ SPF/UPF protection material as HUK's Icon series, and the underarm panel uses Trophy closed-hole, single-knit stretch mesh to maintain protection while maximizing breathability. 90% polyester/10% spandex. Imported.