Yes there is, a one-piece helmet-torso design that allows neck flexibility [1] - this is dated 2012, but I remember reading about it even before 2000. Think it

Yes there is, a one-piece helmet-torso design that allows neck flexibility [1] - this is dated 2012, but I remember reading about it even before 2000. Think it will work much better for sled than American football since there should be much less sudden neck movements. [1] https://cerebrovortex.com/2012/10/04/the-v2-prototype-football-helmet-and-neck-torso-one-piece-attachment-coined-the-h-a-n-t-device-invented-by-dr-todd-aaron/ https://cerebrovortex.com/2012/10/04/the-v2-prototype-footba...