INSTANT LIFETIME guarantee WITH THIS PRODUCT! Thin weight waterproof ankle sock for a multitude of activities, where minimal insulation & maximum breathability are required. Constructed with our proprietary Stretchdry waterproof, breathable & windproof technology Our lightest waterproof sock, ideal for warm wet days Merino wool lining for moisture control & comfort Elasticated ankle & instep offers additional support Y-gore heel construction provides a secure comfortable fit Hand linked toe closure, creates a flat seam to prevent rubbing 40d-waterproof