I purchased this new, opened it, and only tried it on, but the size didn't fit as I expected, so I haven't used it. Color: Black Size: F (Free) Material: 83% Nylon, 17% Polyurethane ★ Includes 4 Made-in-Japan ice packs ★ Maintains 5-10°C for 6 hours ★ Pockets in 4 locations: upper and lower back, and left and right sides of the armpits [From the Workman website] Easy to wear! Experience coolness by directly cooling with ice packs! An essential item for hot days ◎ Includes 4 ice packs! Cooling wear with a high cooling effect that directly cools the body!! Ice Vest ● Product Features ● Easy to wear! ・ Simply insert chilled ice packs (coolants) into the pockets on the back (2 places) and sides of the armpits (2 places)! ・ Set the chilled ice packs (coolants) in the pockets with the cooling surface facing the body! ・ Put on the vest and fasten the buckles to complete wearing ◎ Comfortable fit ・ Power mesh material vest that fits snugly to the body! ・ You can also adjust the size to fit with the buckles on the front ◎ ・ Easy to put on and take off because of the buckle design!