Great — here are top sustainable sandals (recycled or natural materials), with what makes each one eco-friendly and what they’re best for.

1. Birkenstock — Arizona / Gizeh (cork-latex footbed)

• Why: iconic cork + natural latex footbed (renewable cork, natural latex, jute layers); many styles are repairable/resoleable. Best if you want a durable, natural-material footbed and classic everyday wear. (birkenstock.com)

2. Teva — Original Universal / Hurricane (recycled straps)

• Why: Teva switched its signature straps to recycled plastic (rPET/REPREVE) and offers many vegan styles; durable outdoor performance. Great for hiking, water use, and active days. (teva.com)

3. Chaco — Z/Classic series (REPREVE webbing)

• Why: Chaco uses 100% REPREVE recycled polyester webbing in signature straps and emphasizes resoling/repair (ReChaco). Ideal for trail use and long-lasting adventure sandals. (sgbonline.com)

4. Rothy’s — slides/sandals (knit from recycled plastic bottles)

• Why: uppers/knits are made from recycled plastic bottles, produced in a low‑waste, machine‑knit factory; many washable, recyclable components. Good for casual, city wear and those who want recycled-plastic fashion options. (rothys.com)

5. Allbirds — Sugar Zeffer / slides (SweetFoam + recycled straps)

• Why: uses SweetFoam (sugarcane-based, lower‑carbon EVA alternative) for soles and recycled polyester straps — a renewable-material approach to flip‑flops/slides. Best if you want soft, cushioned, low‑carbon soles. (allbirds.com)

6. Xero Shoes — Genesis / sandals (minimalist, recycled/hemp options)

• Why: many Xero styles use recycled PET, hemp, or other lower‑impact materials; the brand emphasizes minimalist designs with long-lasting soles and repairability. Good for barefoot/minimal footwear fans who want sustainable components. (xeroshoes.com)

7. Sanuk — hemp and recycled‑material sandals

• Why: several Sanuk styles use hemp or hemp blends for straps and incorporate recycled rubber/EVA in footbeds/outsoles; casual, comfy, and lower‑impact natural-fiber options. Best for relaxed, beachy looks at generally affordable prices. (sanukon.com)

8. Bedrock Sandals — resoleable leather/natural options

• Why: many Bedrock models use leather or simple, durable components and offer resole/repair programs (resoleable Vibram/PU soles); built for longevity rather than fast replacement. Good for hikers and those who prefer long-lived, repairable sandals. (rei.com)

Quick buying tips

• Decide which material matters most to you (natural cork/latex, recycled plastic, bio-based foam like sugarcane, hemp) and pick a brand that uses that material.
• Look for repair/resole programs and durable construction — extending a shoe’s life is one of the best sustainability wins. (Chaco, Bedrock, Birkenstock and some others offer repairs/resoling.) (birkenstock.com)
• If you want vegan options, check product details (some Birkenstock and Bedrock styles use leather; Teva/Chaco/Rothy’s/Allbirds/Xero offer many vegan lines). (teva.com)

If you want, I can:

• Narrow these to a top 3 based on intended use (daily city wear, hiking, dressy), or
• Find specific models in your size and price range from online retailers.