Every waterproof headphone, watch, or tracker box has an IP rating printed somewhere in small text. Most people never check it — and end up with earbuds that die on their second pool session. Here's what the numbers actually mean.
What Does "IP" Even Stand For?
IP stands for Ingress Protection, part of an international standard (IEC 60529) that rates how well a device resists solids and liquids. The format is always two digits: the first covers dust and solid particles, the second covers water. For swim gear, the second digit is what matters — and it's often written as "IPX" with an X standing in for the (usually irrelevant) dust rating.
The Ratings That Matter for Swimmers
Why the Difference Actually Matters
An IPX7 rating sounds close enough to IPX8 that it's easy to assume they're interchangeable. They're not. IPX7 is tested for a single, temporary dunk — it says nothing about repeated submersion, water pressure during strokes, or an hour-long swim set. IPX8 is the only rating that's actually tested for the kind of continuous underwater use swimming involves, and manufacturers are required to state the specific depth and duration their IPX8 rating covers.
This is exactly why some "waterproof" earbuds marketed for sports work fine for a sweaty gym session (IPX5–IPX7 territory) but fail within a few swim sessions — they were never tested for what you're actually doing with them.
How to Check Before You Buy
- Look for the specific rating (IPX7 or IPX8) in the product spec sheet, not just the word "waterproof" in marketing copy
- For IPX8, check the stated depth and duration — "IPX8, 2m for 2 hours" is a real, useful spec; "IPX8" alone with no numbers is a red flag
- Check whether the rating applies to fresh water only — chlorine and saltwater can behave differently over repeated exposure, even at the same IP rating
- Rinse and dry any swim gear after saltwater or chlorinated pool use — this is standard care advice for any IPX8 device and extends its working life regardless of rating