Foot Petals Killer Kushionz Insole-Rose Set of 3 Pairs by Foot Petals. $72.87. Full insole. Stop the pain of killer shoes with the first ever full insole that can be worn in open toe shoes and sandals! Killer Kushionz combine the comfort and style of Tip Toes with a full arch and heel support! Go ahead, see if those killer shoes can stop you now!