Featuring Seal Skinz own waterproof & breathable stretchy membrane these socks have an anatomical shape & hug your foot so they can worn just like regular walking socks. The elasticated instep & Achilles panel hold your foot providing support & comfort. There is extra padding on the toe, sole & Achilles area for increased comfort. Lined with Merino wool loop pile lining to increase warmth & 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: 3 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. Mid weight sock offering the perfect balance of warmth & breathability. Merino wool lining for warmth & moisture control. Elasticated ankle & insteps offer support & a comfortable fit.