661 Sub Gear Short-Sleeve Padded Baselayer
Built with a special impact material that has a stiff initial impact that slowly conforms to the shape of the body, which gives the protective piece a way to eliminate the heavier, air restricting hard caps that have traditionally been used in pressure suits.
661's Power Stretch fabric is a specific polyester blend that helps wick away moisture, and cool the rider with its evaporative properties. The material performs better than traditional pressure suit materials because of its moisture management capabilities.
This is the armor you wear under your armor. I used mine for BMX racing. It is tight enough to fit under your uniform and light enough not to interfere with body movement. It held up pretty well to a couple minor crashes. The big benefit came from side bumps or slide outs involving landing on the shoulders. Not only was it effective, I managed to re-sell it for a good price after I stopped racing.