User Review: Sea to Summit Reactor Plus Thermolite Liner
Source: bought it new
Price Paid: $55
Really warms up a bag when you are on the cold edge of what your sleeping bag can handle.
- does what it says, warms up the sleeping bag
- can get tangled up in the material
This bag liner is amazing. It really warms up the bag. I was camping with this and my Marmot Atom (40°) and the temps got down into the high 30s. I woke up in the middle of the night chilled so I slipped into this and immediately felt more warmth. Not long after I was getting really warm and had to vent my sleeping bag. I would never guess such a thin fabric would hold in so much heat.
The bag liner packs up pretty small. Not as small as a silk bag liner but not as big as a sleeping bag either. I am tall at 6'1" but this liner fit me just fine.
On the down sides, you have to slide into this from the top and because it is a relatively thin material, if you toss and turn you can end up tangled up in it. Personally I would rather be warm than tangle free but that's just me. Some might find it restrictive.
I definitely recommend this liner for shoulder seasons or any time you are pushing your sleeping bags to their cold limits. Nice insurance to keep you warm through the night.