S Dalowrote a review of Bell Sixer MIPS Helmet on September 29, 2019
Familiarity: I've put it through the wringer
Fit: True to size
First off, for sizing, my head measurement is 57.5 cm around the crown, and the M fits well. I also have a Bell Super DH, size M, and my Super 3R is a L size. All three helmets fit me well; note the different sizes that fit best in the different models. Interestingly they all feel a little different when the adjustable halo is tightened up. The Sixer halo fits snug and low across the forehead, the 3R more along the base of the back of the skull, and the DH more evenly around the skull.
I find the strap adjustments and clasp comfortable, easy to keep straight, and easy to snap closed and back open with gloves on. The combination of Bell's implementation of MIPs, the low forehead and the low drop at the back of the skull, the snug and comfortable fit when wearing the helmet properly (not tipped backwards), and the industry standard ratings, gives me high confidence in the level of protection the helmet affords. It has great air flow, light weight, and overall comfort to go with the long list of features (described in the product description).