These, along with TidWe boots, are boots Dan Infalt was recommending in the past. The GumleafUSA boots are supposedly real rubber like they used to be, not synthetics.
gumleafusa.com

European-made, Natural Rubber Boots & Wellies | Gumleaf USA
European handmade natural rubber boots. Outstanding traction in varied terrain. Durable & oil resistant. Excellent fit for comfortable all day wear.
