FEATURES: Skin Cooler Octovent in front and side panels and Skin Cooler 90 on the entire back, sleeve, and neckline collar. Both Skin Cooler fabrics block up to 90% of UVB rays while providing a cooling sensation. Full-front YKK zipper with bottom "zipper garage" - for on-the-go easy ventilation. 3 back pockets to store racing and or training essentials.Works well for swimming when worn under a wetsuit. Skin Cooler 90 sleeves are designed for more comfort and less drag when in the aero position. Strong yet soft contrast flat stitch. Not recommended for repeated use in a chlorinated pool. Made in the USA Features 3 lower back pockets Easily access training/racing essentials on the go! Bottom Zip Garage Covers skin from zipper, eliminate "zipper bites". Skin Cooler Octovent fabric Close up of meshy Skin Cooler Octovent w/UVB 90 sun protection. Skin Cooler 90 Technology What does it mean for you? Once wet it will drop skin temperature between 7-10 degrees Technology will not wash out Provides UVB 90 sun protection Lightweight, moisture-wicking and breathable "Natural Synthetics" The fabrics developed by De Soto are not treated with any “enhancing” chemicals. These chemicals can irritate the skin and will wash off the fabric over time. This means that De Soto fabrics will not be harmful to your body, and they will perform as described for the entire life of the garment. Skin Cooler SDS and Skincooler Octovent UVB 90 Sun Protection In addition to the smooth, silky SDS fabric we introduced in 2014, we now offer Skin Cooler Octovent SDS, which is created by knitting small octagonal patterns that offer more cooling in the front of a garment. You will find our new tops that combine these fabrics to be cooler and offer more sun protection, while actually being 40% lighter in weight. What makes ours different? Our Skin Cooler fiber is designed to feel and perform like silk (from a silk worm). Through Biomimicry, we and created a synthetic silk. It will keep you cool in hot weather and cooler when it is wet. Put it on and you will instantly feel the cool sensation. Wet it and you will notice a drop in the surface temperature of the skin between 7 and 10 degrees. De Soto Sport Men's Size Chart Sizing Guidance Please refer to the size chart above to ensure an accurate fit. Fit Note - Triathlon apparel is meant to fit next-to-skin. This is to eliminate unnecessary drag during the swim, bike and run and the potential to chafe. Garment will fit the tightest the first time you put it on. It will relax slightly once wet. It will never shrink or pill. If you’re not comfortable with this type of fit and or are between sizes, we recommend sizing up. Fabric Note - Fabric is meshy and show-through, but still provides UVB protection. If you are not comfortable with the sheer "appearance" we suggest wearing a baselayer underneath. CHEST - Fullest part of breast, measured as the largest part of circumference right over the pectoral muscle. WAIST - Circumference measured at the belly-button line - this is NOT the same as your pants waist size. HIPS - Circumference measured at the widest point, NOT at your hips where your belt may go. Typically this will measure just a few inches below your hip bones and around the largest part of the glutes. If you do not have a tape measure and you need something to measure with, use a belt, or smart phone power cord, and a ruler.