Ugg released its highly anticipated Ugg Crochet Boots in late 2007.As with all Ugg boots,the crochet version is lined with sheepskin and has a patented Poron memory foam sole.The knit exterior is flexible,allowing for slouched or tall wear.Crochet Uggs quickly became one of the hottest selling footwear items during the 2007-2008 winter season.In Spring 2009,the Ugg Crochet Boots were still sold out at many retailers.