Earth River SUP 9-7 RIVER S3R-MKII - NEPTUNE Inflatable Paddle Board (9'7"x36"x6")
Earth River SUP 9-7 RIVER S3R-MKII - NEPTUNE Inflatable Paddle Board (9'7"x36"x6")Couldn't load pickup availability
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The Earth River SUP 9-7 RIVER S3R-MKII is a dedicated whitewater inflatable paddle board designed to excel at all areas of river paddling, not just downriver. At 36" wide and 6" thick, it's built to attain upstream to play spots, surf river waves, run rapids, creek, and carry expedition loads — with the ULTRA RIVER core construction and a 48-month warranty to back that use.
Who Is The 9-7 RIVER For?
The 9-7 RIVER is for paddlers whose home water moves. River surfers, river runners, creekers, and river-expedition paddlers get a board shaped for the full range of river paddling, not a flat-water board with river fins. The MKII was designed for paddlers who split a river day between playing a wave, attaining back up to it, and running the stretch below it.
At 9'7" x 36" x 6", it's wide and thick enough to stay steady in current, with the length to hold momentum for attainment moves and expedition miles.
9'7" | 36" wide | 6" thick | 21 lb board weight | Riders up to 290 lb
Why Riders Choose The 9'7" RIVER MKII
All areas of river paddling, one board. The S3R MKII is made for the whole river: attain upstream easily to play spots, surf it, run it, creek it, and paddle expeditions on it. The 36" width gives it the stability moving water demands, and the 6" thickness keeps it riding over features instead of plowing through them.
Grip you can trust in moving water. The X-Ultra Grip deck pad is comfortable for casual sessions but holds your stance when the water gets demanding, and the contoured tail pad gives tactile feedback for rear-foot maneuvers — bottom turns, tail drops, and submerged tail pivot turns.
River construction, river warranty. The ULTRA RIVER core construction with X11 reinforcement layers in key areas is ERS's build for the water that punishes boards hardest — and it's backed by a 48-month warranty.
Built For Years Of Real Use
Rocks, shallow landings, and repeated impacts are just part of river paddling, and the MKII is built for them: ULTRA RIVER core with X11 reinforcement in the areas that take the most wear, at a board weight of just 21 lb — light enough to hike into a put-in. High-grade stainless steel D-rings at the nose, tail, and forward deck take a quick-release leash, tow line, or expedition tie-downs.
The Fin System
The LAKE RIVER COAST™ (LRC) Fin System on the RIVER MKII is a river-specific setup: two short US center fins (4.5" and 3") and two sets of two side click fins (4.5" and 1"), all packed in a padded ERS fin and accessories bag. The short fins suit shallow moving water, and the tuned toe-in angle preserves control; the center fin box accepts any US Fin Box-compatible fin plus FCS Connect™ tool-less center fins if you want to run something else for deeper water.
Full Specs
| Length | 9'7" |
| Width | 36" |
| Thickness | 6" |
| Board weight | 21 lb |
| Rider weight range | Up to 290 lb |
| Construction | ERS ULTRA RIVER Core Construction (X11 reinforcement) |
| Fin system | LAKE RIVER COAST™ (LRC) — two US center fins (4.5", 3") + two sets of two side click fins (4.5", 1"); US Fin Box + FCS Connect™ compatible |
| Deck pad | X-Ultra Grip texture with contoured tail pad |
| Included | Deluxe rolling backpack, high-pressure double-action pump, padded fin/accessories bag, 48-month warranty |
| Recommended use | Whitewater: river surfing, running rapids, attaining upstream, creeking, river expeditions |
Safety note for whitewater use
A standard ankle leash is not recommended for whitewater paddling. Use a quick-release leash, wear a helmet, and wear an inherently buoyant life jacket — all are important safety equipment in moving river water.
Inflation
The ERS 12VDC 20PSI Electrical Pump inflates this board to 15PSI in approximately 11 minutes. The included double-action manual pump inflates on both the downstroke and upstroke, cutting inflation time and effort roughly in half.
How The RIVER Series Fits The ERS Lineup
The RIVER S3R-MKII boards are the dedicated whitewater end of the ERS range. The all-around DUAL boards handle whitewater as one use among many; the RIVER boards are shaped and built for it first — wider (36"), thicker (6"), short-finned, and carrying the ULTRA RIVER construction with a 48-month warranty. Paddlers who want one board for lakes, surf, and the occasional river day are better matched to a DUAL; the RIVER series is for paddlers whose season is built around moving water.
What's Included
Every 9'7" RIVER MKII ships with a deluxe rolling backpack, a high-pressure double-action pump, the padded fin and accessories bag with all included fins, and a 48-month warranty.
Contact a paddling expert on 877-777-1769 for our best package deal price and our review of the pros and cons of the Earth River SUP RIVER Series.
Related Reading:
- How to Choose a SUP Board for Whitewater and River Surfing
- When Should You Consider Buying A 6-Inch Thick Inflatable SUP?
- Why Buy From Pumped Up SUP?
- Which Earth River SUP Board Should I Buy?