Under Armour UA Haw 2.0 800G Boot - Men's Synthetic Full Neoprene rubber upper 800g of PrimaLoft insulation that allows the boot to be lightweight, water resistant, breathable and compressed without losing its superior warmth Internal heel lock memory foam forms to your foot for a secure, customized fit Technical air-mesh lining increases airflow and wicks sweat to keep your foot dry and light Durable high-abrasion rubber textured toe rand