Kansas City Chiefs Sideline Snapback Cap. Introducing the Kansas City Chiefs Sideline Snapback Cap by New Era featuring an Original Fit - contoured to fit closer to the head. Inspired by the Pro fit from the 90's. Made in 100% Ballistic Nylon - Bill with a High Crown High Crown and Structured with DRYERA technology which repels weather-related water. Also featuring COOLERA technology that wicks away sweat.