The Loap REPSON men's summer sandals feature open toes and heels and straps with a velcro fastening. The upper is made from FLYKNIT material while the lining is made from the pleasant tricot material. The insoles and outsoles are made from ultra lightweight Phylon material for walking comfort. The durable polyurethane straps reinforce the feet in three places - two straps are in the front and one on the heel.