I splurged and bought some NRS "Men's Endurance Pants" kayak pants at our local OEX in Mission Bay.
They are well made and serve their purpose when it's not too warm.
They are lined with Hyprotex. That keeps the water out. Don't know if that's considered breathable or not, but to me it feels borderline not.
The specs say yes.
https://www.prokayakfishing.com/prod...e-splash-pants
Amazon Prime, free shipping:
https://www.amazon.com/NRS-Endurance...nts&th=1&psc=1