The Optisym also uses an extruded base, Rail Killer edges, and PU sidewalls for extra longevity, so you can continue to give 'er well after other boards have given up the ghost. 2 x 4 Inserts Urban This ultra-flexible board can be tweaked any way you like, from rails to butter tricks, and it won't wash out on you. Dual Degressive Sidecut This sidecut blends a smaller radius in the center with two larger radii in the tip and tail, making it loose and playful. Nitro's most forgiving sidecut. Whiplash Core Profile This profile features reduced thickness between the inserts with added meat outside your feet for maximum ollie power while maintaining a perfect press flex. Premium Extruded FH Base Durability, speed, and low maintenance all in one ultra clear base material.