# Opium SIOU

> Surfski by Opium. Canonical page: https://surfskiindex.com/surfskis/opium-siou/
> Cite as: Opium SIOU, Surfski Index, https://surfskiindex.com/surfskis/opium-siou/ (checked 2026-10-15). Terms: https://surfskiindex.com/using-our-data/

## Specifications
- Length: 5.25 m
- Beam: 53 cm
- Deck height: 33.5 cm (estimated)
- Layup weights: Composite 13 kg
- Usually paddled by: New paddlers

## Ratings (Surfski Index estimates)
- Stability band 8–10 out of 10 (dimension estimate, low confidence).
- Speed rated 4 out of 10.

Modelled from published beam, length and deck height. Low confidence. Speed is our rating. Both are given at the hull's own design weight.

These ratings are Surfski Index estimates, worked out from published dimensions, traced hull shapes where we have them, and reviews. They are not supplied by the maker or timed on the water. How a ski feels depends on your weight, skill, set-up and the conditions, so use them to shortlist skis and paddle one before you buy. Method: https://surfskiindex.com/how-it-works/#limits

Evidence note: This band is estimated from published dimensions. Qualitative context includes 1 paddler report and 4 linked sources.

## Paddler weight
Estimated sweet spot 76–89 kg, broader estimated guide 62–92 kg. An estimate from hull dimensions, not the designer's intended weight.

## Suits
First sessions, flat water and sheltered coast.

## Hull
5.25m x 53cm beginner ski and the newest boat in the range, launched with a published 13kg weight and a stated 60-110kg paddler capacity. Shortest surfski Opium builds, and the only one in the range with a published weight.

## What works
- Published 13kg weight, light for a beginner ski
- Stated paddler capacity range
- Newest hull in the range

## Trade-offs
- Short waterline caps the speed
- No price published anywhere
- Effectively unavailable outside South America

## Generations
- current: Opium Caiaques is a Brazilian builder with the widest ski range in South America: seven surfskis from an elite 6.45m racer down to a 5.25m beginner hull, alongside OC1, OC2 and OC6 outriggers. Opium publishes an overall hull height for each boat; that figure is not the deck height this index uses for weight bands, so it is not carried across.

## What paddlers say
- No independent owner review located as of August 2026.

## Sources
- https://www.caiaquesopium.com.br/
- https://www.sestaro.com.br/category/tipos-de-embarcacoes/
- https://surfski.info/media/kunena/attachments/1589/WidthxlengthsurfskisJuly2025_2025-09-08.pdf
- https://paddlenews.com.br/surfski/mercado-opium-lanca-o-seu-novo-modelo-de-surfski-siou/

## Prices
Current new prices and dealers: https://surfskiindex.com/surfskis/opium-siou/#buy