The Butte is the perfect cold weather boot to sport all winter long. Full-grain leather upper features a waterproof and windproof eVent membrane that vents moisture from inside the shoe for a durably waterproof boot. Fully lined with UGGpure. eVent Fabric: Through Direct Venting proprietary and patented technology, millions of tiny pores are able to breathe at their full potential, allowing sweat to vent directly to the outside of the fabric in one easy step. Removable/replaceable UGGpure insole. UGG Australia teamed up with Vibram to produce a technical and sleek outsole. Measurements: Heel Height: 1 1 2 in Weight: 1 lb 5 oz Circumference: 16 1 4 in Shaft: 7 1 4 in Product measurements were taken using size 8, width D - Medium. Please note that measurements may vary by size. Weight of footwear is based on a single item, not a pair.