Inside tag says US 7 (EU 38), I think they will fit sizes 7-7.5 even with socks on.Waterproof nylon and EVA shell• Adjustable toggle closure with two points of adjustability for a secure fit• Temperature rated to -35°F/-37°C to ensure a warm wearing experience• EVA shell for a lightweight and flexible fit• Dual heel loops for ease of entry• Anti-stink lining helps reduce odors• Recycled PET linings• 200g insulation• 400g insulation on footbed• Non-marking outsole with extra grip for superior traction• Merrell temperature ratings are based on high activity levels and can be affected by many conditions, including weather, wearer's activity level, fitness, metabolism, perspiration, circulation, exposure time, clothing, and cold sensitivity.