US Patent 10156268 Boot with insert

A boot assembly for a constant velocity joint includes a boot having a neck portion arranged to be received over a shaft that is coupled to the constant velocity joint, and a retainer or insert which may include a vent. The retainer or insert may be carried by the neck portion and has at least one flex feature to facilitate flexing thereof. The insert may have at least one projection that extends radially inwardly from the neck portion and defines part of an inner surface of the boot, or at least one vent path defined therein to facilitate venting of one or more chambers defined at least in part by the boot.