U.S. patent application 20190169390 (applicant Peterson Chemical Technology LLC, Austin, Texas):
"Combinations of open cell flexible foams with polyurethane gel particles, and methods of making the combinations are described using a variety of procedures. The open cell flexible foam may partially or wholly comprise polyurethane foam and latex foam. ... The composition of claim 1 where the polyurethane gel particles contain at least one phase change material with a solid/liquid phase transition temperature range of from about −10° F. to about 220° F. (about −23° C. to about 104° C.)."