Booster Seat, Grey, Material: Cotton, Polyester, Machine Washable
From Amazon
Stokke Tripp Trapp Classic Cushion, Icon Grey - Pair with Tripp Trapp Chair & High Chair for Support and Comfort - Machine Washable - Fits All Tripp Trapp Chairs
Lesters Nurseryworld
Stokke® Tripp Trapp® Classic Cushion Icon Grey