The Senna features a buoyant one-piece Skylite upper An embedded SuperCush sock-liner Rubber traction pods fr better grip Ventilated perforation Vegan Friendly: People Footwear's lineup of lightweight footwear is all PETA approved and we only use non-animal and synthetic leathers in our design and development process The Senna features a buoyant one-piece Skylite upper, an embedded SuperCush sock-liner, rubber traction pods, and ventilated perforation.