Nothing.

Gore Tex and the microfiber alternatives all can keep you dry from rain at about any temperature, but you will sweat at temps above maybe 55 deg. F.

That's about everyone's experience with any so-called breathable and waterproof gear. You still likely need to carry top and bottoms for a tour, as you sometimes can sweat a but but want the wind off you in the rain else you get hypothermic. So carrying and using becomes a necessary evil.