Birkenstock Boston Regular Fit pairs the brand's anatomical cork‑latex footbed with a lambswool-lined suede upper for warm, supportive comfort in colder weather. Product image is indicative. Key attributes: Black | Suede leather | Warm lambswool lining | Breathable lining | Lightweight EVA outsole | Adjustable strap with metal buckle | Anatomical cork-latex footbed | Lambswool-covered insole | Closed-toe clog silhouette | Suede upper | Metal buckle engraved Birkenstock | Full lambswool interior | Dimensions & fit: Regular Fit | Fits true to size; naturally generous last | Available in two widths | Composition & care: Upper: suede leather | Lining: lambswool | Insole: lambswool | Footbed: cork and latex | Outsole: EVA | Brush suede with a soft suede brush when dry. Apply a suede protector spray before first use (test on an inconspicuous area). Avoid excessive water; let dry naturally away from direct heat. Do not wash the lambswool lining; air it after use. Clean the EVA outsole with a damp sponge and mild soap.