Bridgedale provide a 3 year guarantee on any Bridgedale sock that contains WoolFusion®.The word ‘Endurance’ is connected with an activity, it leaves no doubt that long-haul resilience and toughness is required. If you are intending to take on a real winter challenge, The Bridgedale Endurance Summit Knee High Sock should be your partner. Using their WoolFusion® technology, Bridgedale combines tough new wool with Endurofil yarn to provide high performance insulation, moisture wicking and durability to this expedition quality long sock, with dense cushioning throughout, including a double density foot pad, for extra warmth, impact resistance and comfort.(05/12)