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Data sheet updated in October 2026
The ION Long John 2.5 men's is ION's 2.5 mm neoprene long john: a sleeveless, long-legged wetsuit for summer and in-between seasons. Your arms remain free, while your torso and legs are covered. ION uses Velcro for the shoulders, Flatlock seams for the panels, and rates it for water temperatures from 21 to 26 °C. It comes in Black and Dark Blue. Sixteen variations are available, including long cuts in Black.
KEY INFORMATION
ION LONG JOHN 2.5 MEN'S - Sleeveless 2.5 mm neoprene long john
What we like
- Free arms: This sleeveless design lets your shoulders and arms move without restriction for paddling or holding the bar.
- 2.5 mm neoprene: Enough to keep your torso and legs warm in water from 21 to 26 °C, the range specified by ION.
- Velcro at the shoulders: The straps are adjustable, allowing the top of the long john to fit each individual's build.
- Flatlock seams: The panels overlap before being sewn, a seam ION describes as both strong and flexible.
- Limestone neoprene and Aqua-α glue: A foam made from limestone, not petroleum, laminated with a water-based, solvent-free adhesive.
- Long cuts in Black: Four long sizes, 94/ST, 98/MT, 102/LT, and 106/XLT, for taller riders.
Available sizes
Color
Black (10 sizes, including long cuts), Dark Blue (46/XS to 56/XXL)
Included / Not included
✔️ Included: 1 ION Long John 2.5 men's long john
✖️ Not included: Neo top, Boots
DETAILED DESCRIPTION
The long john by ION
A long john covers your torso and legs while leaving your arms bare. ION places the ION Long John 2.5 in its sleeveless neoprene collection, designed for transitional days between seasons. This thin neoprene dries quickly, limits wind chill, and maintains maximum flexibility. ION also presents it as the top choice for regulating heat and perspiration during high-activity sessions. The 2.5 is the 2.5 mm version of this long john; the Long John Element 2.0, at 2 mm, completes the range.
Construction
The shoulders are adjustable with a Velcro strap, which ION calls the Velcro_Adjuster. The neoprene panels are assembled with Flatlock seams: they overlap before being stitched. The Aqua-α glue that binds the layers during lamination is water-based, with no added solvents. The foam is made from limestone, without petroleum-derived neoprene. ION provides the composition as 80% neoprene, 20% polyamide.
For what conditions
ION rates it for water temperatures from 21 to 26 °C. Here in Pornichet, it's a full summer wetsuit, and the one for warm water trips. When the wind cools down, a neoprene top worn over it covers the arms. For an Atlantic spring or autumn, a 3/2 full wetsuit remains warmer.
Colorways and sizes
Two colors are available: Black and Dark Blue, a deep blue. The Black comes in ten sizes: from 46/XS to 56/XXL, plus the long cuts 94/ST, 98/MT, 102/LT, and 106/XLT. The Dark Blue ranges from 46/XS to 56/XXL. That's sixteen variations in total. On the ION page, the model is 1.88 m tall and wears size L.
SIZE GUIDE
| Size | Height (cm) | Weight (kg) | Chest (cm) |
|---|---|---|---|
| 46/XS | 169 to 175 | 54 to 62 | 88 to 93 |
| 48/S | 172 to 178 | 62 to 70 | 93 to 98 |
| 94/ST | 179 to 184 | 65 to 74 | 92 to 98 |
| 50/M | 175 to 181 | 70 to 78 | 98 to 103 |
| 98/MT | 182 to 189 | 73 to 82 | 97 to 103 |
| 52/L | 178 to 184 | 78 to 86 | 103 to 108 |
| 102/LT | 185 to 192 | 81 to 90 | 102 to 108 |
| 54/XL | 181 to 187 | 86 to 94 | 108 to 113 |
| 106/XLT | 188 to 195 | 89 to 98 | 107 to 113 |
| 56/XXL | 184 to 190 | 94 to 102 | 113 to 118 |
TECHNICAL SPECIFICATIONS
| Specifications | |
|---|---|
| Type | Men's long john, sleeveless, long legs |
| Thickness | 2.5 mm |
| Adjustment | Velcro at shoulders |
| Seams | Flatlock |
| Glue | Aqua-α, water-based, solvent-free |
| Neoprene | Limestone-based foam, without petroleum-derived neoprene |
| Water temperatures according to ION | 21 to 26 °C |
| Composition | Made from 80% neoprene and 20% polyamide, as specified by ION. |
| Color | Black, Dark Blue |
| Sizes | 46/XS to 56/XXL; 94/ST, 98/MT, 102/LT and 106/XLT in Black |
| Supplier reference | 48202-4111 |
FAQ - ION LONG JOHN 2.5 MEN
This is for the rider who kitesurfs, wingfoils, or surfs in summer. They find a full suit too warm and want to keep their arms free. It is also a good choice for warm water travel. For mid-season on the Atlantic coast, a full suit is preferred.
First, the thickness: 2.5 mm for the ION Long John 2.5, 2 mm for the Element 2.0. ION gives the same water temperature range for both, 21 to 26 °C, and the same composition. On the 2.5, ION details the adjustable Velcro shoulders, Flatlock seams, Aqua-α glue, and limestone neoprene. Both are available in Black and Dark Blue.
The ION size guide higher on the page provides height and weight, with chest circumference for each size. The tall cuts 94/ST, 98/MT, 102/LT, and 106/XLT roughly match the chest circumference of 48/S, 50/M, 52/L, and 54/XL for a taller height. These are available in Black only. A long john should fit snugly when dry, without air folds. If you are between two sizes, call us.
Rinse it with fresh water after each session. Turn it inside out and let it dry in the shade on a wide hanger. Never put it in the sun or on a radiator. Never fold it wet in a bag.
We are a Kite, wing, and Surf shop in Pornichet, on the Atlantic coast. We ride all year. We wear ION neoprene before we sell it. If you have a doubt about the size, or hesitate between two thicknesses, call us or visit the shop.
▶ Need advice?
GlissEvolution, 2c avenue du Gulfstream, 44380 Pornichet (Loire-Atlantique)
09 62 64 74 77 | WhatsApp: 07 83 28 39 94, Tuesday to Saturday, 10am-1pm / 3pm-7pm
Test center available by appointment
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