Thank you for viewing our products. Instant purchase is OK. Thank you. Applied technology from spacesuits. A new material cooling vest! This vest, made with a special material that freezes at 26 degrees Celsius, fits the body and provides cooling! It's thin enough to be worn as an inner vest, making it useful in various situations such as work and leisure. PCM (Phase Change Material) is a new material with a focus on temperature regulation, developed by applying spacesuit technology to protect astronauts' bodies from sudden changes in external temperature. Normally, water freezes at 0 degrees Celsius, but this PCM material is characterized by its ability to adjust the freezing temperature. Breathability: By securing air spaces between the PCM blocks, it eliminates stuffiness even when in close contact with the body. Furthermore, by using it in conjunction with air-conditioned clothing, the fan's air flows through the air spaces, making it more comfortable to use. Mobility: The unique arrangement and placement of the PCM blocks allow for movement such as bending forward, bending backward, turning left and right, and tilting sideways. It can also be folded and stored in a small space. Storage: Velcro fasteners are used on both shoulders, allowing for size adjustment to fit the body. Furthermore, the front and back parts can be separated, allowing for compact folding, making it easy to store in the gaps of refrigerators, freezers, and cooler boxes.