Silk Blend Sleeping Bag Liner

Yes - any extra layer traps insulating air, so it will add some warmth. If you are looking for a thermal boost, check out the Reactor liners

Yes. It can be washed in a machine with normal supermarket detergent - avoid fabric softeners which reduce wicking performance. Air drying is recommended (if you have to machine-dry a Silk Blend liner, use a cool setting)

Not side zippers, which would add a lot of weight and bulk, but snaps on both shoulders mean a wider opening than some liners for entry and exit

The liner is impregnated with bio-based amino sugar polymers that absorb and neutralize odors. When the liner is washed, the compounds that cause odor are released, and the polymer is ready for the next use