I have been using a Sweet Strutter on and off for the past 10 years. The Strutter is a M/L and fits great and I have on occasion tried on a M/L Sweet Rocker when in a kayak store but have always found them a little bit too snug. Last year I tried on the new “plastic” Rocker in L/XL and bought it. The best helmet will always be the one that offers you the best protection and fit.
The new Rocker is made from a plastic outer with carbon fibre re-enforment at key points. The padding is similar to that found in bicycle helmets and is covered with a lightly padded fabric cover. Self adhesive shims are supplied with the Rocker so you can customise the fit.