Supplemental Foundation Layer (SFL)™ $299 MSRP GOLS certified Size Twin Twin XL Full Queen King Cal. King Twin Twin XL Full Queen King Cal. King This item qualifies for free white-glove shipping with delivery through the 1st threshold Add To Cart Find a Local Retailer Pairs well with Supplemental Foundation Layer (SFL)™ Adds $299 to your order Size Twin Twin XL Full Queen King Cal. King Twin Twin XL Full Queen King Cal. King Wooly™ (3") Adds $629 to your order Size Twin Twin XL Full Queen King Cal. King Twin Twin XL Full Queen King Cal. King Certified Organic Wool Pillow Adds $89 to your order Size Standard Queen King Euro Boudoir Body Loft Light Medium Full Standard / Light Standard / Medium Standard / Full Queen / Light Queen / Medium Queen / Full King / Light King / Medium King / Full Euro / Full Boudoir / Medium Body / Full Details The GOLS certified Supplemental Foundation Layer™ is made of natural coir fiber and encased in GOTS certified organic cotton fabric. The SFL™ pairs well with your existing frame or foundation to help ensure additional and proper support of your mattress. Twin (38x75") • Twin XL (38x80") • Full (54x75") • Queen (60x80") • Eastern King (76x80") • Cal King (72x84") *Eastern King will be shipped in 2 pieces each measuring 38"x80" Imported The SFL™ is recommended to be used with our REST line of mattresses as the coil springs used in most supporting box springs are approximately 3” in diameter. Although many more pocket coils are used in the Rossa™, Clara Nouveau™ and Stella™ than are used in other mattresses, their diameter is closer to 1 1/4”. What this means is that to prevent the pocket coils from resting on an unsupported space, our SFL™ is required on all box springs and on wood slat foundations with spacing between the slats greater than 1”. × This item is only available from our local retailers. You may also like @sleeporganic Follow us to stay in touch, for exclusive promotions, organic living and more!