Keen St Barts Slide Sandals Blue Fade Ombre Womens Size 5M 35EU The Keen St Bart's Sandal is a laid-back flip-flop named after a laid-back Caribbean island. The St Bart's Sandal has a cushy EVA footbed that molds to your foot and a hydrophobic (water-hating) lining, so if your sandal gets wet,the lining will be dry before you know it. Keen's signature toe protection shines, even in the St Bart's flip-flop design