The adidas Terrex Free Hiker COLD.RDY boots feature an adidas Primeknit upper for a glove-like fit, a lightweight, durable design and a BOOST midsole. GORE-TEX Duratherm technology insulates you from snow, mud and water and keeps your feet dry when walking on snowy or muddy trails. COLD.RDY technology retains body heat and keeps feet warm and comfortable.