The Boulder Gear Girl's Cooper Snow Bib will keep them moving on all their winter adventures! The fabric has a waterproof/breathability rating of 10k with critical seam sealing to prevent moisture from seeping in. It has 80g of lightweight polyester insulation for consistent warmth. Adjustable shoulder straps and waist band ensure a snug comfy fit. The articulated knee design gives them a full range of motion and the Grow feature allows you to let out the hem on the legs 1.5" so they don't outgrow them too fast.