preowned Gumbies Outback Slipper - Charcoal/RedSeason: Brand: Gumbies The slipper uppers are made from recycled PET (post-consumer plastic bottles) which is turned into a soft brushed felt. The double-layer construction provides warmth, comfort and durability. The classic slip-on style features Castor insoles. Super-soft, comfy foam made with castor oil, a naturally derived material helping to reduce the need to use crude oil. Each insole has a top layer of recycled brushed PET felt for added softness. Each pair of our Outback slippers have a recycled rubber Gumtread™ outsole. The outsole is designed to be flexible for comfort and durable to take you further than your back door. Life is too short for complications. Keep it simple, after every adventure slip into the Outback. Technical Details Uppers - Felt made fromrecycled PET (post-consumer plastic bottles) each pair contains 8 recycled plastic bottles. Insoles - Castor foam with recycled brushed PET felt top layer. Outsole - Recycled Gumtred rubber.