Firewire Boss Up 7'4 48.4L — Kelly Slater's first performance midlength, co-designed with Dan Mann and Kevin Schulz as the ultimate one-board quiver for surfers who want genuine performance at higher volume.

Built to bridge the gap between midlength paddle power and shortboard performance, the Boss Up's I-Bolic Core — an I-beam internal frame with high-density foam rail construction — delivers a dynamic flex pattern that accelerates in weak surf and holds through committed rail turns.

• I-Bolic Core technology: I-beam frame + high-density foam rails for dynamic, lively flex
• Kelly Slater + Dan Mann design: performance midlength for surfers who don't compromise
• 7'4" x 48.4L: catches anything, handles waist-high mush to overhead surf
• FCS II 5-fin compatible: thruster or quad (quad recommended for best performance)
• One-board travel quiver: genuinely versatile across all conditions and wave types

At 48.4L, this is the largest and most versatile size in the Boss Up lineup — built for bigger surfers, beginners stepping into performance shapes, or anyone who wants a no-excuses travel board.

Sizing: Ideal for surfers riding shortboards in the 35–38L range, or bigger surfers stepping into the midlength performance category. Pair with the KS1 Fin Set as a quad.

Care: Rinse with fresh water after each session. Store away from direct sunlight and heat.