Everbilt 24 in. x 48 in. x 2 in. XPS Waterproof Backer Board for Shower Benches and Seats (sold in carton of 3 - 24 sqft total) EVB2448500BP - The Home Depot
Amazon.com: OasisSpace Bamboo Shower Bench, 24" Waterproof Shower Chair with Storage Shelf, Wood Spa Bath Organizer Seat Stool, Perfect for Indoor or Outdoor : Health & Household
Bambusi Bamboo Shower Seat Bench with Storage Shelf for Seating, Support and Relaxation by Bambsi BEL-SSB - The Home Depot
2-Tier HDPE Heavy Duty Shower Bench with Handle and Storage Shelf - Costway
Amazon.com: Teak Shower Bench, Teak Shower Stool with Storage Shelf, 20" Waterproof Shower Chair for Bathroom, Portable Wooden Spa Bath Seat, Indoor and Outdoor Use, Shower Bench for Elderly : Health &
Amazon.com: 16.5" Teak Corner Shower Stool for Shaving Legs/Corner Shower Bench with Shelf/Shower Foot Rest/Waterproof Bathroom Bench Seat for Small Spaces : Health & Household