Herring Oslo (Warm Lined) rubber-soled Chukka boots in Brown Calf - Herring Sale. Herring Oslo is a warm-lined Chukka boot on a genuine lightweight Vibram sole. This makes it a super boot for all-day wear in a colder climate. The sole colour may vary slightly to photo shown. Upper: Calf Leather. Sole: Rubber-soled. Features: Formal, Derby/Gibson, Boots, Lace ups, Country styles, Rubber-soled, handmade, Italy, lasted, Warm lined, blake-stitched, plain, Chukka boots, Mens, lightweight-sole, lace-up-boots, derby-boot, Lace Boot. Herring Shoes Oslo (Warm Lined) rubber-soled Chukka boots