The Fredericia Pato Sledge Armchair (Stacking) — by Hee Welling & Gudmundur Ludvik — is a refined, multifunctional armchair featuring a shell made from 100 % recycled polypropylene mounted on a solid steel sledge base, offering stackability for up to 11 chairs on the floor or 16 on a trolley, and combining sustainable material logic with Scandinavian minimalism and durability.