Dense loops of a Merino wool/Acrylic yarn mix provide soft padding in key strike zones at the heel and ball of your foot, and are extended across the toes, ankle and the Achilles for added cushioning and protection. The mid-foot area has a thinner ventilation zone that allows your foot to breathe and not get uncomfortably hot, and to stop the sock slipping they have incorporated an arch brace for additional support and a custom fit.Merino wool - soft and moisture-wickingVentilation zones - aids breathability to keep you coolPadded strike zones on the heel, toe, ball of foot and achillesAnti-bacterial - keeps feet freshFlat toe seam - prevents rubbing and irritationPack of two pairsMaterial: Main areas: 98% Nylon, 2% Elastane. Padding zones: 70% Acrylic, 30% Merino Weight: 120g (per pair)