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| FCS Fin Size Chart | Fin Size |
| Under 120lbs | XS |
| 140 - 155lbs | M |
| 165 - 200lbs | L |
| 190lbs+ | XL |
| Futures Fin Size Chart | Fin Size |
| 75 - 115lbs | XS |
| 105 - 155lbs | S |
| 145 - 195lbs | M |
| 180lbs+ | L |
| Longboard Fin Size Chart | |
| Board Size | Fin Size |
| 6' - 6'11" | 6"Â +/- |
| 7' - 7'11" | 7"Â +/- |
| 8' - 8'11" | 8"Â +/- |
| 9' & up | 9" +/- |
Futures QD 4.0 Alpha Rear Quad Fin
The QD2 4.0 Alpha is a medium size Balanced quad rear with a Ride Number of 6.5. Alpha's C6 composite material is carbon and air infused making it lighter than Honeycomb. The responsive flex characteristics of C6 combine with the neutral QD2 template and symmetrical foil make this set ideal for pairing with your favorite front fins, creating the ideal Quad option. All Alpha products are designed and manufactured exclusively in Huntington Beach, California.
Features:
| Area | 11.67 |
| Height | 4.05 |
| Base | 3.87 |
| Foil | SYMM |
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