These gorgeous Collegien Slippers feature perforated, breathable soles that help stop tumbles and falls, and a warm upper sock that will keep little feet warm and cozy. Beautifully constructed out of high-quality materials and processes these delightful French made socks are great fun. With gorgeous colours and tones these knitted socks are perfect for those little feet. If your size is 39, you should take 40/41. If your size is 38 or 38 1/2, take size 38/39. This is valid for all sizes.