Egypt's Dar al-Iftaa answers readers' questions in various fatwas. We at See publish these fatwas. The question says:
Is it permissible to perform ablution while wearing breathable nail polish?
Answer
Breathable nail polish is manufactured in a way that allows both air and moisture to pass through it to the nail making the nail polish water permeable. Breathable nail polish is healthier as it allows the nail to breath. Therefore, in this case the nail polish is not waterproof and does not prevent water to seep into the nail and thus acts like the henna.
And God Almighty knows best.