Where it fits
This model is classified as Competition High Performance Shortboard. Use the documented family, selected size and intended conditions to decide whether that direction matches the surfer's brief.
Competition High Performance Shortboard
Rusty Underdog
The Underdog is a collaboration between Caio Ibelli and Rusty Surfboards shaper, Pedro Battaglin. The Underdog is Caio's favorite high-performance board for competition on...
Official manufacturer information
Typical surfer profile
Progressing to Expert surfer seeking a competition high performance shortboard.
Wave direction
The available board information associates this model with beach break, open face, point break. Confirm the intended wave range with the manufacturer.
Where it sits in the design range
The Underdog sits in the Competition High Performance Shortboard family with a Competition High Performance Shortboard direction. Related models may solve a different design job even when their volume is similar.
Dimensions and volume
Available size range
5'10 to 6'6, 21.5L to 38.5L across the reviewed board specifications. The table below shows the complete available size range.
| Length | Width | Thickness | Volume | Construction |
|---|---|---|---|---|
| 5'10 | 18.51 | 2.35 | 26.5L | Standard |
| 5'10 | 19.50 | 2.57 | 30.5L | Standard |
| 5'11 | 18.64 | 2.41 | 27.5L | Standard |
| 5'11 | 19.63 | 2.60 | 31.5L | Standard |
| 5'5 | 17.86 | 2.10 | 21.5L | Standard |
| 5'5 | 18.85 | 2.39 | 25.5L | Standard |
| 5'6 | 17.99 | 2.15 | 22.5L | Standard |
| 5'6 | 18.98 | 2.43 | 26.5L | Standard |
| 5'7 | 18.12 | 2.20 | 23.5L | Standard |
| 5'7 | 19.11 | 2.47 | 27.5L | Standard |
| 5'8 | 18.25 | 2.24 | 24.5L | Standard |
| 5'8 | 19.24 | 2.50 | 28.5L | Standard |
| 5'9 | 18.38 | 2.30 | 25.5L | Standard |
| 5'9 | 19.37 | 2.54 | 29.5L | Standard |
| 6'0 | 18.77 | 2.42 | 28.5L | Standard |
| 6'0 | 19.76 | 2.63 | 32.5L | Standard |
| 6'1 | 18.90 | 2.45 | 29.5L | Standard |
| 6'1 | 19.89 | 2.65 | 33.5L | Standard |
| 6'2 | 19.03 | 2.48 | 30.5L | Standard |
| 6'2 | 20.02 | 2.68 | 34.5L | Standard |
| 6'3 | 19.16 | 2.51 | 31.5L | Standard |
| 6'3 | 20.15 | 2.70 | 35.5L | Standard |
| 6'4 | 19.29 | 2.55 | 32.5L | Standard |
| 6'4 | 20.28 | 2.72 | 36.5L | Standard |
| 6'5 | 19.42 | 2.57 | 33.5L | Standard |
| 6'5 | 20.41 | 2.74 | 37.5L | Standard |
| 6'6 | 19.55 | 2.60 | 34.5L | Standard |
| 6'6 | 20.54 | 2.76 | 38.5L | Standard |
Board design direction
- Public family
- Performance Shortboard
- Detailed category
- Competition High Performance Shortboard
- Also suits
- competition
- Ability guidance
- progressing, intermediate, advanced, expert
- Fin configuration
- Thruster
- Wave intent
- beach break, open face, point break, powerful
- Strengths
- paddle, wave entry, speed generation
- Trade-offs
- glide, turning radius
Guidance describes board characteristics, not a guaranteed performance outcome.
Board DNA
A compact view of how this board is designed to behave. Live stock and sizing remain the main purpose of this page.
- Paddle
- 8 / 10
- Speed
- 8 / 10
- Drive
- 7 / 10
- Release
- 8 / 10
- Hold
- 7 / 10
- Forgiveness
- 8 / 10
- Sensitivity
- 7 / 10
- Outline
- balanced
- Rocker
- medium low entry / medium tail
- Rails
- medium
- Quiver role
- daily driver, one board quiver
Quivrr Board DNA is derived from current manufacturer design information and governed Quivrr classification.
Check current regional availability
Stock is not baked into this page. Choose a region to run a current Quivrr search.
Other boards in this family
Related design guidance
How to choose a surfboard, understand volume and sizing, or ask Bodhi to explain trade-offs.
Quivrr Board Intelligence is generated from governed Board DNA, current board range information and manufacturer source information. Board information updated 2026-07-16. Confirm final specifications with the manufacturer or retailer.