What's the deal with the sizing of THE One Helmets; do they make one size helmets and then put different size padding kits in them? Or are the helmets different sizes? As well, are different size padding kits needed to make for a snug fit? I'm looking at getting a medium (58-59 cm) but would I need size large pads for it? If it helps any, my current helmet is a medium Remedy, which is a snug fit. Thanks in advance.