i.Polarmax Men’s Heavyweight Zip Mock is constructed out of high-performance 87% Acclimate Dry Polyester & 13% Spandex. The Heavyweight stretch is the ideal extreme cold weather piece. Blending heavyweight warmth, moisture management, breathability, stretch/recovery and antimicrobial, you can wear it as a layering compliment during cold weather and a standalone piece during cool weather. With Acclimate Dry moisture management system and Ag47 antimicrobial/anti-odor you will stay dry, comfortable and odor-free during high-exertion activities in cold weather. Construction features include Clean Seam flat-seam technology to minimize irritation or chafing, heavy brushed fleece next-to-skin helps trap warmth, smooth finish face for easy layering, shoulder yokes to improve movement while reducing friction/irritation, under-arm gussets added for even more flexibility, zipper “garage” cover to reduce possible under chin friction/irritation and elastic thumb loops to cover hands or aid in layering. Fabric: 87% Acclimate Dry Polyester / 13% Spandex. Body Length (Size Large): 30” / 76 cm. Weight: 8.0 oz/sq. yd / 227 grams.