Please note! Sizes are in inches, not regular shoe sizes Sizing: Measure your foot from 'back of the heel' to the end of your longest toe. We suggest that you go UP 1/2 inch from the size you measure on the tape if you are between sizes. -35°F to 50°F Best to be used as a camping slipper to sleep in light use around a cabin, house to tent. or inside a boot as a liner. Features: – Patented AERIS ™ 1000 Insulation Technology (1" / 25mm of loft) Maintains Warmth, Even When Wet. – Exceptional warmth even when wet. Materials: – 100% Polyester Mesh Lining – 100% Polyester Micro Rip-Stop Taffeta with DWR Finish – Durable Polyester PU Foot Bed *Made in the USA Weight 14 oz Dimensions 12 × 12 × 3 in SIZE IN INCHES 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12