Hot Chillys youth thermal base layers will keep kids warm and super comfy when it's chilly outside! Lightweight, midweight, and mountain weight fabrics are available in both body fit or relaxed fit kid’s thermals. Engineered with performance in mind, we use the same technical properties on our thermals for toddlers as our adult base layer collections. Look for these various fabric properties in several of our Hot Chillys youth thermal base layer thermals: UPF 30+ or 40+ protection, 4-way stretch for unlimited movement, odor blocking properties, moisture transfer fibers and even some fun, cool prints! 'Cuz kids want to stay warm, dry, and comfortable so that they can have fun, too! Browse our entire collection of youth base layers and kid’s thermals today.