Montbell Lock-On Sandals "Designed to maintain complete mobility with a back strap that securely holds the heel. This is accompanied with Montbell's original strap design to allow for wearing with socks on. The strap material is soft to promote comfort against the skin." Unique strap pattern and a rear strap maintain mobility by keeping the instep and heel in place Montbell's original strap design allows use with socks on Cushioned EVA strap feel comfortable against the skin Material: Upper: polyester, E.V.A. foam Sole: rubber Size S (US Women's 6.5-7.5) *Note first image is purely to show the sandals worn (these are black and not yellow)