Yes, you can pee in your Knix. All period proof underwear absorbs all kinds of fluids, not just blood but also pee, sweat and discharge.
Can you pee in Knix? - period proof underwear
Can you pee in Knix? - period proof underwear
Can you pee in Knix? - period proof underwear
Can you pee in Knix? - period proof underwear
Can you pee in Knix? - period proof underwear
Can you pee in Knix? - period proof underwear