A modern, lighter look with a mix of full grain and nubuck leathers from ECCO's gold-rated tanneries, combined with premium textiles Soft, ultra-light PHORENE™ midsole for bounce and energy return Ultra-warm 400g PrimaLoft® Bio™ insulation, which is biodegradable and made from 100 per cent recycled materials, keeps feet warm even in colder temperatures Innovative, distinctive outsole with Michelin rubber, multi-directional grooves and two distinct zones for grip, durability and support Even on the coldest winter days, you can still reconnect with nature in the ECCO ULT-TRN, a Scandinavian take on the classic leather hiking boot. With 400g PrimaLoft Bio™ insulation and a waterproof membrane, your feet will stay warm and dry when you hit the trails. Shank provides the additional stability you need on the trails ECCO's waterproof membrane keeps your feet dry