Casper The Layer Twin Mattress Topper = NEW In Box. The Casper Mattress Layer is outrageously comfortable. The Casper Layer is intended for dorm mattresses, the floor , and other less than desirable surfaces. The item "The Casper Layer Twin NEW!Comfortable Mattress Topper" is in sale since Thursday, March 22, 2018. This item is in the category "Home & Garden\Bath\Toilet Brushes & Sets". The seller is "sellallthisstuff" and is located in Lithia, Florida. This item can be shipped to United States.