Correctly fitting and adjusting your Deckvest is key to its comfort. The Spinlock range of lifejackets are designed to be incredibly comfortable and as lightweight as possible so they can be worn for extended periods of time.
Ensure both waist and back adjustments have been used (if applicable). Typically, Deckvest lifejacket should sit higher up the body, the front almost in line with the sternum, and the top should shape and fit around the shoulder, not sitting on the neck. Please see the Spinlock videos to ensure you have it correctly fitted.