For over twenty-five years ACORN has been providing their customers with products that furnish you with "comfort on earth". The ACORN Products Company began with one product - ACORN slipper socks made with grey twist wool. ACORN slipper socks were brought on board the space shuttle mission Columbia in 1982 by astronaut Ken Mattingly. Several other products are now available from ACORN. ACORN Cotton/Leather Slipper Sock or the ACORN Wool/Leather Slipper Sock. ACORN Women's or men's Textured Print Moc Slipper has the ACORN memory foam insole. These wonderful socks are also available in children's sizes. The Kid's ACORN Versa Print Fleece sock can be worn with sandals, sports shoes and boots.