Women's Birkenstock Uppsala Shearling Boot The Birkenstock Uppsala Shearling Boot blends cozy comfort with a clean, minimalist silhouette. Designed with a suede upper and a soft shearling-lined interior, this boot offers warmth and a comfortable step-in feel. The classic Birkenstock cork-latex footbed supports all-day wear, while the flexible outsole provides dependable traction for everyday winter use.