If you love branded sleepwear, we also have best-selling shapewear from Calvin Klein, Shein, etc. Birkenstock is a luxurious German footwear and shoe brand owned by L Catterton. The brand was founded way back in 1774 by Johann Adam Birkenstock, and it is headquartered in Linz am Rhein, Rhineland-Palatinate, Germany. Many popular shades of gray are smoke gray, ash gray, charcoal gray, etc.