From Amazon
Stokke Sleepi Mini Protection Sheet, White - Protects Oval Stokke Sleepi Mini Mattress Against Accidents & Spills - Exterior Made of Breathable 3D Mesh - Machine Washable
Lesters Nurseryworld
Stokke® Sleepi™ Mini Protection Sheet V3
This product is also available at 1 unverified merchant.