The Spyder Momentum Mens Long Underwear Top is a high performance baselayer top. Constructed with the Avra fabric technology in a seamless, stretch construction. Avra is an ultra-thin polyester fiber that are held together by a proprietary removable polymer. The result of it all is a silky fabric that keeps you drier and more comfortable. The Spyder Momentum Top will have you operating at peak performance all day by being effective at wicking moisture, drying quickly, and regulating your core. 51% Avra / 25% Nylon / 24% Elastane, Seamless Construction, High Low Knit Textures Add Dimension, Fit: Tight, Warranty: Lifetime, Wind Protection: No, Material: Synthetic, Weight: Light, Type: Top, Wicking Properties: Yes, Water Resistant: No, Recommended Use: Snow, Antimicrobial: No, Anti Odor: No, Quick Drying: Yes, Moisture Wicking: Yes, Model Year: 2020, Product ID: 584419, Model Number: 198030 001 S/M, GTIN: 0192636019294