Abstract: A collapsible and waterproof article of footwear includes a flexible insole, a flexible three-layer sole pad having (1) a bottom layer that is formed of a flexible material and includes a bottom surface adapted for engagement with a surface upon which a user walks, (2) a top layer that is formed of a flexible material and includes a top surface that supports the flexible insole, and (3) a middle-layer having (a) a front-portion that is relatively rigid and is located generally under the ball of a user's foot, a (b) mid-portion that is relatively flexible and located generally under the arch of a user's foot, and (c) a rear-portion that is relatively rigid and is located generally under the heel of a user's foot. A collapsible upper has an outer layer of material and an inner layer of material, the outer layer of material being waterproof and breathable, and the upper being collapsible onto the flexible insole. A waterproof seal connects the three-layer sole pad and the upper.