FUTURE FOAM 3 inch thick High Density Blue Swirl or Copper Swirl Memory Foam 10030MEMORY3 - The Home Depot
Amazon.com: Blue EVA Foam Sheets, 30 Pack, 2mm Thick, 9 x 12 Inch, by Better Office Products, Blue Color, for Arts and Crafts, 30 Sheets Bulk Pack : Arts, Crafts & Sewing
DermaBlue+™ Foam - DermaRite Industries, LLC.
Amazon.com: Rolyan Temper Foam, 1" x 16" x 24", Plain Backed Sheet, Blue, Medium Density, Case of 1 : Health & Household