The new Flash Down Booties weigh an average of 3oz (85g) per pair in the Medium size. 1/4" foam insole provides just enough warmth and support beneath your feet while the 12Denier ripstop nylon shell allows the down to reach its maximum loft potential. A simple elastic draw closure above the ankle keeps the cold air outside while your feet stay cozy and warm. At just 1 1/2 oz (42g) per foot these booties must be packed away or on your feet because they are light enough to blow away on a windy day if you leave them out. Features: a Made in USA a Unisex Sizes XS - XL a Extremely light (average total weight 3oz/85g per pair) a Elastic draw cord closure a High Lofting Goose down insulation a Superior quality 1/4" EV50 foam insole a 70denier coated nylon rand and outsole a 12denier ripstop nylon outer shell material