Length. Longer = more rail line in the water (drives through a turn, holds through flat sections, paddles better). Shorter = quicker rail-to-rail, tighter in the pocket, gives up some drive. Five Horizons rewards length less than the Innuendo does — the BRO outline already generates paddle, so most customers size their Five Horizons to match their everyday shortboard length.
Width. Narrower = holds a line in clean, fast waves; faster rail-to-rail. Wider = paddles better, more stable in softer surf, sits flatter on rail. Five Horizons runs slightly wider than peers through the middle to give the BRO sizing intent its real benefit.
Thickness / volume. More volume = more paddle and more margin on soft days. Less volume = sensitive underfoot; rails sink cleanly; turns feel crisper. Size for the waves you actually surf, not the ones you hope to surf.
Between sizes? We usually size up in volume (not length) for softer waves, and down in volume for overhead surf with real push. The drive-priority contour rewards committed riding — pick the volume that lets you commit, not the volume that makes you sit.