DeFeet only creates a sock model when there are significant features worthy of a new model. The Levitator has several such features. Fitting into the Forefoot Cushion category, Levitator takes up a little more volume in the shoe than a Thin sock does. The extra padding in the ball of the foot area keeps you running and riding comfortably with less friction and better fit. For runners and cyclists looking for that high performance, no extra space in their shoe type of fit, the Levitator is the best choice. For those looking for a thin sock fit with extra comfort in the strike zone, Levitator really works. Sizing: Small Women 6 8 Medium Men 7 9 Women 8.5 10.5 Large Men 9.5 11.5 Women 11 13 Extra Large Men 12.