The Acton Neo Sox is an 11.5" insulating neoprene sock made from 2.5 mm thick neoprene, specially designed for rain boots. Washable, breathable and antimicrobial, it helps retain warmth while keeping feet comfortable and dry. Its stretch fit naturally conforms to the shape of the foot for optimal comfort. Ideal for use with rubber, PVC, PU and other utility boots, it provides an extra layer of insulation to help you stay comfortable in cool, wet conditions.