SF 49ers Contoured Flip Flops - team color Official NFL Unisex Flip Flop Beach Shoes Sandals slippers size medium SF 49ers Contoured Flip Flops - Official NFL 2012 Unisex Flip Flop Beach Shoes Sandals slippers size small medium = (Men 8-9) Soles measure approximately .75" thick Quality embroidery Men's sizing: SM fits 6-7, MD fits 8-9, LG fits 10-11, and XL fits 12-13