LensCoat telephoto lens covers offers your valuable equipment some protection from scrapes and bumps, preserving its resale value.
The LensCoat 100-400 has small hole on the last segment which lines up with the red dot indicator, making it easy to quickly line up your lens with camera mount even with the cover installed.
Please note that the The LensCoat Canon 100-400 IS cannot cover the fixed portion of the lens barrel due to the manner in which the lens barrel extends/retracts leaving approximately 3 inches exposed when the lens is fully extended.