Earbud IP ratings explained: what the two digits mean, and which one your sweat needs

The 40-word definition

IP stands for Ingress Protection. The code is defined by IEC 60529, an international standard that specifies laboratory tests for how well an enclosure keeps out solid objects (first digit) and water (second digit). A maker runs the tests, or has them run, and prints the result. Higher is more protected; the digits are not cumulative across tests in the way most people assume, which is why a product can be IPX7 without an IPX5 claim.

Both digits, in one table

Definitions per IEC 60529 as summarized by Keystone Compliance, an accredited test laboratory.

The first digit: dust

For earbuds the dust digit matters less than the water digit, and makers often skip it (hence the X). A 5 means dust-protected: some can get in but not enough to interfere. A 6 means dust-tight. Trail runners and anyone who trains outdoors in dry, dusty conditions have a reason to prefer a 5 or 6; gym users mostly don't. Chalk, for lifters, is the exception.

The second digit: water

This is the one to read. The jump from 4 to 5 is the jump from “splashed” to “sprayed with a nozzle from every angle,” and it's the jump that separates rain-rated earbuds from ones that survive a soaked hour. The jump from 6 to 7 is the jump from jets to being underwater. A 7 is a defined test (30 minutes at up to a meter); an 8 is whatever the maker states beyond that, which is why Shokz says “swimproof (2 m)” next to the OpenSwim Pro's IP68 and H2O Audio says 12 ft next to its IPX8.

What the X means

Untested, not zero. IPX4 means the water test was run and the dust test wasn't. Bose rates the Ultra Open Earbuds IPX4; Cleer rates the ARC 5 IPX7; Creative rates the Outlier Free Pro IPX8. None of those makers claims a dust result, and none is hiding a bad one; they just didn't run it.

What the tests actually do

What the tests skip

• Salt. Sweat and sea water aren't in the standard. Salt conducts and corrodes; the rating says nothing about it.
• Soap and hot water. Showers aren't tested either; see IPX7 earbuds, showers and swimming.
• Chlorine. Makers state pool limits separately (Shokz: 2 m; H2O: 12 ft).
• The charging case. A rating applies to what the maker says it applies to. Shokz lists the OpenFit 2 buds at IP55 and the case as “not waterproof.”
• Time and repetition. The test is one exposure of a new unit, not six months of daily sweat.

Which rating sweat needs

Sweat over an hour is a slow soak with salt in it, running into hinges and charging contacts from above. It is more than a splash and less than a dunk. For a normal gym, IP55 is the floor we use on every list. For heavy sweaters, spin and hot yoga, IP57, IPX7, IP67 or IP68. For rain runs, IP55 covers it; IP67 lets you rinse the pair afterward, which is the habit that actually extends its life. The three-way comparison people search for most is at IPX4 vs IPX5 vs IPX7; why sweat matters at all is at can sweat damage earbuds.

Picks at each rating