Here are top sustainable loafers (women’s & men’s styles) across budgets and priorities, with a short reason to buy and a source so you can check details:

Top picks

• Nisolo — best overall ethical leather loafers (good factory transparency, LWG tannery sourcing & Climate Neutral/B‑Corp practices). Great if you want durable leather made with worker pay and traceability in mind. (nisolo.com)
• Rothy’s (The Loafer / Driving Loafer) — best machine‑washable, low‑maintenance sustainable loafers (knit uppers made from recycled plastic bottles; factory zero‑waste certs). Comfortable, easy care. (rothysnewmarkets.myshopify.com)
• Everlane Day Loafer — classic, sustainably audited leather option (uses Leather Working Group–rated tanneries; cleaner‑chemistry commitments). Good for a polished everyday loafer. (everlane.com)
• Bourgeois Boheme — best vegan/animal‑free loafers (made in Portugal from Italian vegan leathers, focus on slow design and ethical production). Good if you want non‑animal materials and artisan construction. (veganchic.com)
• Vivaia — best budget-friendly eco loafers (recycled‑plastic knit uppers, plant‑based/low‑carbon components on some styles; affordable). Good for trendy, vegan, low‑cost options. (blog.vivaia.com)
• Sézane — best eco‑luxury leather loafers (vegetable‑tanned leather, made in Portugal/Spain with audited ateliers). Great for a higher‑end wardrobe staple that leans toward traditional, lower‑impact leather methods. (sezane.com)
• Allbirds (Tree Loungers / Tree Skippers) — best natural‑fiber slip‑on/loafer‑style (eucalyptus/TENCEL knit uppers, sugar‑cane foam midsoles; carbon‑neutral / B Corp). Very comfortable, casual, and climate‑focused. (amazon.com)
• Oliberté — best for supporting artisan / African supply chains (ethical, traceable leather sourcing and handmade lines; focuses on durable leather goods). Good if you prioritize social impact in sourcing. (oliberte.com)

Quick buying tips (what to look for)

• Certifications & transparency: prefer brands that publish supply‑chain info and use third‑party standards (Leather Working Group for tanneries, Climate Neutral/B‑Corp, factory audits). LWG shows tanneries’ environmental management (water/chemicals/energy). (leatherworkinggroup.com)
• Materials trade‑offs: recycled PET knits (Rothy’s, Vivaia) reduce landfill/plastic waste but are still plastic‑based; responsibly sourced leather (LWG/vegetable‑tanned) can be lower impact per year of wear because leather often lasts longer — check lifecycle and repairability. (rothysnewmarkets.myshopify.com)
• Care, durability & circularity: choosing shoes you can repair, resole, or recycle (brands that offer take‑back/repair or use durable leather) stretches the footprint over many wears — look for brand repair/takeback programs or resoling options. (Nisolo and some others publicize takeback/repair programs.) (nisolo.com)
• Fit & style: many sustainable knits (Rothy’s, Vivaia, Allbirds) are more flexible and casual; classic loafers in leather (Everlane, Sézane, Nisolo) give a more formal look and often last longer if cared for.

If you tell me your priorities (vegan vs. leather, budget, men’s or women’s sizing, dressy vs. casual) I’ll narrow these to the 2–3 best exact models and where to buy them.