【Upgraded Design, Lighter And More Breathable】: As we all know, the conventional bump cap has two big challenges：weight and heat. To tackles these, we have developed this super lightweight and breathable bump cap. The bump cap insert is made of a lightweight, high-density ABS material and 360°ventilation on insert is designed to offer maximum ventilation for continuous airflow and superior breathability.The bump cap weight is only 145g.All without compromising protection. 【Comfortable Bump Cap For Head Protection】：Removable high-density ABS interior shell with foam padding offers protection from minor bumps.Soft inner foam cushion for comfortable wear.Reflective piping adds extra visibility.Bump cap and Baseball cap in one,not bulky like a hard hat,looks stylish like a normal baseball cap.Use only to protect from minor bumps and scalp lacerations. 【One Size Fits Most】:Size can be adjusted with a elastic strap to give a quick, secure fit.Brim Length: 50mm（1.96 in）. Cap insert headform size: 54-64cm(21.2-25.2 in). 【Widely Used】:GREENDEVIL Lightweight safety bump cap is great for workers in the low-risk workplace, for use on worksites where hard hats aren’t required, but added head impact protection is still needed to shield against bumps, scrapes, bruises and other minor head injuries, contain areas with low beams, pipes, passageways or other low hanging obstructions, ideal for mechanics and airline baggage handlers as well as workers in warehouses, factories, in-home services and other industries. 【Tested & Approved】:GREENDEVIL bump caps meet EN 812:2012 standard, the world’s only standard for bump caps.If you have any questions, welcome to reach us，we will make things right, FAST!Customer service will not be beat！ We listened and collected users' voices to do some size updates, then we launched this bump cap with upgraded inner ABS insert size. The original bump cap insert size is more suitable for users with smaller head circumference, while the upgraded bump cap insert size is more suitable for users with regular or larger head circumference.