Discover why Sara Blakely launched $545 Sneex sneaker heels and how smart sellers are capturing their share of the $2.1 billion hybrid footwear market. Our comprehensive analysis reveals the highest-opportunity platforms, buyer personas, and profit margins in fashion's fastest-growing segment. From Amazon's 25,000 weekly sales to Shopify's 9/10 opportunity scores, learn which marketplace combinations generate 6-figure revenues for online seller