You can't have full waterproofing with full breathability, not at the levels of exertion involved in cycling, going for a walk/hike sure, but not cycling, vented armpits help and keeping the airflow from neck to bum helps, but you're still gonna get sweaty.
You can't have full waterproofing with full breathability, not at the levels of exertion involved in cycling, going for a walk/hike sure, but not cycling, vented armpits help and keeping the airflow from neck to bum helps, but you're still gonna get sweaty.