Hot Chilly's uses 100% polyester micro denier yarns to create a wind and water resistant barrier through construction, then lightly napped to add softness and warmth with less bulk than normal fleece. The Pepper Fleece Print Zip-T Top breathes easily so the little ones won't overheat, and keeps them dry through moisture management. They know that their base-layer looks super cool. Features: Flat seam construction to reduce bulk and abrasion Sleek, performance-friendly rubber tip zipper Zip-through collar construction for added warmth Drop tail for easy tucking 3 fun prints to choose from Moisture transfer fibers Mountain-Weight: Warmest products Relaxed Fit