From Cariuma: 

The SLIP-ON PRO is an ultra-comfy, easygoing style for casual sessions and weekend kickbacks, built for optimal board feel and a longer lifespan. For a rip-resistant toe area, we added a rubber underlay and overlay. A snug mid-foot band secures your arch at all times (you’re the only one who should be flying)

• Upper: LWG-Certified Premium suede, organic cotton canvas, rubber reinforcements
• Lining: Cotton canvas
• Sole: 100% slip-resistant, natural rubber
• Insole: Mamona oil, bio-based cork inserts
• Construction: Handmade vulcanized sneaker; fully stitched outsole