like i said i have a thicker shorter neck, really anything more than a mx jersy made it uncomfortable, i wore it a coulple times with my thor sentinal chest protector and i had to put it on top of the leatte. it was really comfortable with just the jersey... when i sled i usually wear a underarmor cold gear turtle neck, a thermal longsleave and my outer shell that doesnt really have insulation but its got fleece inside the collar. just doesnt work for me sledding. but im considering wearing my sentinal chest protector undermyshell