I bought an expensive mattress which is nice and supportive, with no roll together, but found my partner (much smaller than me) was saying she was getting pins and needles in her arms and legs from it. Bought this topper in single size to put her side of the bed, and it made it the perfect combo of supportive, but has the extra give so no numb limbs, just pure comfort. We then decided to get king size for the whole bed, as I preferred it too!