The Jes Extender is a penis extender that has several short comings, including its ability to provide long lasting comfort to its patients. The reason that your penis may be turning cold or blue is due to constriction of blood circulation. This is due to the poor design of their Comfort Strap and Silicone Tube, which results in a uncomfortable fit. Our recommendation may be using something like the X4 Labs Upgrade Kit, which will allow you to use their Comfort Strap and Hybrid Support piece.