Our Long Sleeve Zip Mock Neck features our patented IceFil technical fabric. It works by converting sweat to refrigerant; cooling your skin 3 to 5 degrees, allowing you to be cool, comfortable and dry on the hottest humid days. This garment also has built-in UPF 50 sun protection, moisture-wicking, and anti-microbial properties. This style has a mesh underarm panel promoting additional comfort and breathability. Wear the Long Sleeve Zip Mock Neck to all athleisure activities! IceFil® Fabric Technology Flat weave, anti-microbial, stretch fabric with textured interior is ultra soft and comfortable. Knit Fabric: 92% Nylon 8% Polyurethane Mesh Fabric: 80% Nylon 20% Polyurethane FABRIC Icefil® fabric converts sweat into cooling energy so you stay comfortable on hot humid days. Fast-drying moisture-wicking fabric with two-way circulation helps keep you cool and dry. Mesh underside of sleeves facilitates additional airflow to keep you cool. UPF50+ offers superior sun protection. For the active women who is on the go or relaxing poolside at your favorite resort. Cruise-wear and leisure-wear CARE Machine wash cold with similar colors. Do not bleach. Do not use fabric softener. Tumble dry low if needed. Do not dry clean.