Is the Ketchum fully waterproof?

Yes. It uses a fixed GORE-TEX LTD liner, which is waterproof and breathable. The shell is not laminated, so the outer fabric can soak up water in long downpours even though you stay dry inside.

Does it come with a back protector?

No. Shoulder and elbow Nucleon Flex Plus protectors are included at CE Level 1. The back pocket is sized for an Alpinestars Nucleon back protector, which is sold as an accessory.

Is it good for hot summer riding?

It is built for all-weather use, and the fixed liner makes it warmer than a mesh summer jacket. It works best in cool, wet or mixed conditions rather than peak heat.

How does it compare with Alpinestars' laminated touring jackets?

Laminated jackets bond the waterproof membrane to the outer shell, so they absorb less water and dry faster. The Ketchum keeps GORE-TEX protection in a lighter, simpler build with fewer features.