NIKE Women's Solarsoft Comfort Thong Synthetic Synthetic Leather,Polyester Text UPPER: More feminine, fashionable and sporty thong strap. MIDSOLE: Dual-injected Nike Solarsoft technology topped with a premium memory foam. OUTSOLE: Unitsole with flex grooves and sculpted medial arch. A new extension of the Comfort family, combining memory foam and Nike Solarsoft technology for the pinnacle comfort proposition.