Re-envisioning Surf Classics with Purposeful Materials. The Slip-On VR3 SF remakes our iconic surf-based slip-on with sustainability-conscious design. Featuring uppers made from regeneratively grown cotton canvas, an outsole that uses natural rubber, and a biobased foam footbed for comfort you can feel good about, this deconstructed slip-on shoe with a collapsible heel fuses modern and vintage detailing.