The Spring Revolution 2.0 Trekking Moderate Socks 645 are Mid Size socks designed for the outdoor world. Made with light but resistant Merino Extra Fine, a yarn that keeps feet warm and thanks to the presence of specific structures located at the ankle level - prevents sprains and protects from impacts.Spring Revolution 2.0 Trekking Moderate Socks 645 FeaturesProtection structure in reliefAnkle protection structureProtective structure of the Achilles tendonSpring Revolution 2.0 Trekking Moderate Socks 645 Materials42% WO MERYNOS WOOL / 52% PA POLYAMIDE / 6% EA ELASTHANSpring Revolution 2.0 Trekking Moderate Socks 645 MaterialsSmall (EU 35-38 / UK 3-5.5)Medium (EU 39-42 / UK 6-8)Large (EU 43-46 / UK 9-11)Approximate Sizing. More info