Youth Winter Base Layer Top & Bottom Set. Breathable, wicking performance and lightweight stretch comfort. Just like busy kids, the kids' Burton Lightweight Base Layer Set is designed to stretch, breathe, and dry quickly. It's the technical head-to-toe combo that'll keep your little ripper warm and dry whether they're on the mountain, the playground, or just sitting on the couch. Plenty of Tech DRYRIDE Ultrawick lightweight knit is highly breathable and ultra-fast wicking to keep kids dry and warm. Everyday Feel A regular fit, non-tech look, and a soft hand give them a casual, everyday feel that keeps kids comfy anywhere. Features + Tech. Dryride Ultrawick Birds Eye Mesh Fabrication. Chafe-Free Softlock Seams for Comfort. Quick-Drying and Highly Breathable. Stretch 180° For Enhanced Mobility. Double Needle Stitching on Sleeves and Hem Thumbhole Cuffs. Thumbholes Sizing XS 6/7, S 8, M 10, L 12, XL 14-16 Sizing XS 6/7, S 8, M 10, L 12, XL 14-16 Youth Winter Base Layer Top & Bottom Set. Breathable, wicking performance and lightweight stretch comfort. Just like busy kids, the kids' Burton Lightweight Base Layer Set is designed to stretch, breathe, and dry quickly. It's the technical head-to-toe combo that'll keep your little ripper warm and dry whether they're on the mountain, the playground, or just sitting on the couch.