Caribbean Birkis Caribbean This waterproof sandal is perfect to tote to the beach or pool. It has drain holes in the sides to let the water out and is very lightweight. Made of EVA compressed foam and is quite durable. Pacific Birkis Pacific The Pacific, Birki's single band beach sandal, is tough, light, and waterproof - perfect for the beach, pool, or shower. The contoured footbed provides good arch support and keeps you comfortable all day. Soles are slip-resistant on wet surfaces.