A Blundstone wool sock two-year NO-HOLE warranty tells you how confident we are that you will love these new slate Blundstone socks. Woven of pure, ethically sourced Merino wool, this natural fibre is the best material we know for sock-making. Wool fibres insulate while absorbing moisture and releasing it to the atmosphere for dry comfort. Special ribbing ensures socks stay up when pulled up, down when squished down, or anywhere in-between. (Sock fans, you know what we're talking about.) Braced arch for foot comfort and support. Best boot sock we've seen.