Is the Bulge on My Inflatable Paddleboard Normal?

Short answer: Yes. A small raised area — or "bulge" — on one side of your inflatable paddleboard (iSUP) is completely normal. It's caused by the valve mounted on the opposite side of the board, and it does not affect performance, durability, or safety.

If you've just inflated your board for the first time and noticed a slight bump, don't worry — your board is not defective. Here's what's happening and why it's expected.

Why the bulge appears

Your paddleboard is built using a drop-stitch core — thousands of fine threads that connect the top and bottom surfaces of the board. When inflated to full pressure, these threads pull the two surfaces taut and flat, giving the board its rigidity.

The valve is a solid, rigid component bonded directly into this core so you can inflate and deflate the board. Because the valve base is firm and inflexible, the drop-stitch threads around it sit slightly differently than the threads across the rest of the board.

The result: directly opposite the valve, the surface can't lie perfectly flat, so a small, smooth bulge forms. In other words, the bulge is simply the board balancing the pressure around the rigid valve housing on the other side. It's a natural consequence of how every drop-stitch iSUP is constructed.

This is normal and expected

A valve-related bulge is:

• Cosmetic only — it has no impact on how the board paddles, glides, or floats.
• Structurally sound — the area is fully sealed and holds pressure just like the rest of the board.
• Common to all inflatable paddleboards — this is inherent to drop-stitch construction, not unique to your board or a sign of a fault.

You can paddle, stand, and store your board exactly as normal. The bulge will not grow over time under correct use, and it does not weaken the board.

How to tell a normal bulge from a real problem

A normal valve bulge is small, smooth, firm, and located directly opposite the valve. It stays the same shape and size once the board is fully inflated.

Please do get in touch with us if you notice any of the following instead, as these can indicate a separate issue:

• A bulge that is soft, growing, or moving across the board.
• A bulge that appears away from the valve area.
• Any hissing sound, or the board losing pressure over time.
• Visible damage, splitting, or separation of the seams or surface layers.