Featuring Sealskinz own waterproof & breathable stretchy membrane these socks have an anatomical shape & hug your foot so they can worn just like regular socks. The elasticated instep & Achilles panel hold your foot providing support & comfort. Lined with Merino wool to increase comfort & wicking performance. To maximise the performance of these great socks you need to have a close fit, so please check out your size below. Sealskinz Thermal Rating: 2 out of 5 so if the weather is really freezing you can boost the performance of these socks with the Seal Skinz thermal liner socks. Totally waterproof, breathable & windproof. Our lightest sock, ideal for warm, wet days. Merino wool lining for moisture control & comfort. Elasticated ankle & insteps offer support & a comfortable fit.