Nylon or composite highbacks (often glass-filled nylon) are the most common type you'll find, and for good reason. They offer a balanced flex that gives you solid heel-side response while still allowing some lateral give—meaning you can tweak grabs and press without feeling locked in. They also do a great job absorbing vibrations, so choppy terrain feels smoother underfoot.
These highbacks are ideal for all-mountain and freestyle riders who want a mix of control and playfulness. If you're hitting the park, cruising groomers, or just starting out, composite highbacks give you forgiveness and versatility without sacrificing too much performance.
The main trade-off is that they're not as responsive as carbon or hybrid options when you're charging hard at high speeds. But for most riders—especially those who value tweakability and comfort over maximum power transfer—nylon/composite is the sweet spot.