Simmons have been at the forefront of the mattress industry for close to 150 years now. They are a renowned United States mattress manufacturing company.
From Simmons' website:
We were the first mattress company to introduce a king and queen size mattress in the 1950s, and in 2008 we invented a hybrid technology that fused memory foam and Pocketed Coil, leaving the rest of the industry scrambling to follow. For us, it’s always been about innovating relentlessly—so you can get the rest you deserve.