The Muck Hale Winter Boot will keep your kids comfy and dry, no matter what they get into. Even if you can't keep up with them, their Muck Boots will. The stretch fit topline binding is snug around the calf to keep warm air in and cold air out Fully insulated with 4mm NEOPRENE. This provides the optimal warmth, comfort, and waterproofing that you expect from a Muck Boot. The PK Mesh lining allows for breathability The Diamond tread self cleaning outsole wraps the entire perimeter for maximum protection and stability that doesn't track mud 100% waterproof Comfort range: sub freezing to 65 F18 C Average weight: 1 lb. 5 oz.