100% Polyester.
. M-XXL. Available only from Hammacher Schlemmer, this is the sweater-fleece vest that provides four levels of heat for chilly fall and winter evenings. It’s powered by an unobtrusive lithium-ion polymer rechargeable battery that provides up to seven hours of heat on low (113u00B0 F), six on low/medium (122u00B0 F), five on medium/high (131u00B0 F), and four on high (140u00B0 F).