Apara Women Gel Slingies Insoles Slip your feet into the comfort zone while maintaining your style with Apara fashion Gel Slingie. Made of a silky smooth gel that conforms to the shape of your foot Slingies are sized and tapered to fit all types of shoes. These fantastic length insoles give you luxurious cushioning all the way from the base of your heel to the ball of your foot. Clear gel cushioning for the ball-of-foot and heel. Adhesive backing for secure placement.