Designed to deliver the maximum abrasion resistance during wear if you want a sock that will repeatedly last as long as a marathon aerobic pace hike then our twin pack mens storm bloc with blueguard aerobic socks should be at the very top of your outdoor clothing list high strength filament polymers have been bound and engineered to create our blueguard yarn exhaustively developed and tested to produce a whole range of socks that set new benchmarks in abrasion resistance and durability tea