Experience easy to wear comfort in the womenâs Merrell Siren Flip Q2 sandal. The waterproof, nubuck leather upper features an adjustable hook and loop closure for a secure fit. The textured EVA footbed adds comfort for all-day wear, while the heel air cushion absorbs shock. The durable outsole delivers traction and stability for all day wear. Waterproof, nubuck leather upper with hook and loop closure for a secure fit.; Breathable Lycra® neoprene lining.; Textured EVA footbed for added comfort.; QFORM® 2 dual-density midsole with heel-centering technology, provides engineered alignment.; Merrell air cushion in the heel absorbs shock.; Merrell In-Board Compression molded EVA foot frame provides cushioning.; Durable outsole deliver traction and stability.; 3.0mm lug depth.; .