The Terramar 2.0 Thermolator Crew Kids Long Underwear Top is an essential piece that provides warmth, comfort and function. The midweight fabric is ultra-soft and features ClimaSense Thermoregulation Technology that automatically adjusts to your body temperature. When you are cool it traps air to maintain warmth. When elevated activity kicks in, and increases the surface temperature, the fabric allows moisture vapor to escape, as you maintain comfort. Whether skiing, snowboarding or being adventurous in cold weather conditions, The Thermolator is first-rate functional performance. ClimaSense Thermoregulation Technology keeps you comfortable in all conditions, Fast wicking and drying, Ultra-soft brushed surface traps air, 4-way stretch for ease of movement, Engineered to adjust to your body temperature, Midweight warmth, UPF rating 25+, Fit: Loose, Warranty: One Year, Wind Protection: No, Material: Synthetic, Weight: Mid, Type: Top, Wicking Properties: Yes, Water Resistant: No, Recommended Use: Snow, Antimicrobial: Yes, Anti Odor: Yes, Quick Drying: Yes, Moisture Wicking: Yes, Model Year: 2022, Product ID: 411499, Model Number: W7537 010 S, GTIN: 0721357143966