The HKM Functional Shirt � Aruba � Long Sleeve is a high-performance equestrian top designed to keep you comfortable during training and rides, crafted from elastic, breathable fabric with mesh side inserts and vent holes in the back for excellent air circulation. Featuring a stand-up collar, front zipper for easy on/off, reflective detailing and SPF 40 sun protection, this tailored-fit shirt combines sporty functionality with stylish seams to help riders stay cool, dry and protected in warm-weather conditions or layered under jackets in transitional seasons.