Specifications: 1/9 Pocket Hat is the new product to solve people???¦s trouble which is patent in the U.S.A., Japan, China, Germany, Australia, Taiwan, ...etc. The opening diameter is 38 cm which is over the effective size (hat edge must be over 3 inches) for sunshade issued by Academic Organization. You only twist it lightly, then the hat will gather into 1/9 size (diameter 13 cm) and you may put it into the pocket smoothly. The angle of hat edge is adjustable and you may change it to cowboy or causal styles at ease. The hat is with the effect of UV resistant over UPF24 which is most suitable for outdoor activities, such as traveling, fishing, climbing, golfing, hiking??Ketc.