Not every liner is about warmth. We took four Sea to Summit liners on our big trip from Sydney to Adelaide, Melbourne and back, and tried them all. The Sea to Summit Comfort Blend Liner is the odd one out: a rectangular liner made to keep you cool and your bedding clean, with a sleeve for your pillow. It was the cheapest of the four, at $60.
What’s in the box
A rectangular liner in a soft stretch knit of 70% polyester (Coolmax) and 30% Tencel lyocell, with a pillow sleeve at the head end and dark grey trim around the opening. It comes in a grey stuff sack with a drawcord, and the fabric has HeiQ Fresh odour control. There’s also a version without the pillow sleeve.
What we like
- Cool and soft on warm nights
- Coolmax and Tencel stretch knit
- Rectangular: room to move
- Sleeve to hold your pillow
- Packs smallest: 15 × 7.5 × 12 cm
- Good value at $60
What we don’t
- Adds no real warmth
- No zip
Quick Specs
| Spec | Details |
|---|---|
| Brand | Sea to Summit |
| Material | 70% polyester (Coolmax)30% Tencel lyocell |
| Weight | 290 g |
| Packed size | 15 × 7.5 × 12 cm |
| Shape | Rectangular |
| Temperature rating | No warmth addedMade to keep you cool |
| Features | HeiQ Fresh odour control |
| Included | Pillow sleeve |
Cool and soft
The Comfort Blend doesn’t try to make your sleeping bag warmer. The Coolmax and Tencel knit is made to wick moisture and help regulate your temperature, so it’s the liner for warm nights, or for a clean layer between you and the bedding when travelling. It’s soft and smooth against the skin, a different feel from the fleece and Thermolite of the Reactors.
Shape and pillow sleeve
It’s rectangular, so there’s more room to move your legs than in the mummy-shaped Reactors, and it suits a rectangular sleeping bag or a mattress in the rooftop tent. At the head end there’s a sleeve that you slide your pillow into, so the pillow stays put on the liner. There’s no zip: you slide in from the top.
Weight and packing
At 290 g it’s about the same as the Reactor Lightweight, and it packs the smallest of our four, to about 15 × 7.5 × 12 cm, so it’s easy to bring along as well as a sleeping bag or a Reactor.
Vs the other liners
We’ve reviewed all four Sea to Summit liners we took on the trip. The three Reactors are mummy liners made to add warmth: the Reactor Fleece is the warmest and our favourite, the Reactor Extreme sits in the middle, and the Reactor Lightweight is the lightest.
This review Comfort Blend |  Reactor Extreme |  Reactor Fleece |  Reactor Lightweight | |
|---|---|---|---|---|
| Adds warmth | – | 6°C | 8°C | 4°C |
| Material | Coolmax, Tencel | Thermolite Pro | Grid fleece | Thermolite Pro |
| Shape | Rectangular | Mummy | Mummy | Mummy |
| Opening | Top, no zip | Top, snaps | Side zip | Top, snaps |
| Packed size | 15 × 7.5 × 12 cm | 19 × 11.5 × 11.5 cm | 20 × 13 × 13 cm | 18 × 10 × 10 cm |
| Weight | 290 g | 350 g | 379 g | 286 g |
| Price paid | $60 | $130 | $110 | $90 |
| Our score | 8.5 | 8.9 | 9.3 | 8.7 |
Conclusion: Sea to Summit Comfort Blend LinerConclusion
The Sea to Summit Comfort Blend Liner is a rectangular Coolmax and Tencel liner made to keep you cool, with a sleeve that holds your pillow in place. It weighs 290 g and packs the smallest of our four Sea to Summit liners. It adds no real warmth and has no zip, but for $60 it’s a soft, clean layer for warm nights and travel.
A rectangular Coolmax and Tencel liner with a pillow sleeve, made to keep you cool and your bedding clean.
290 g, packs small, $60; adds no warmth.
- Travellers
- Car campers
- Rooftop tents
Yes, for warm weather and travel. $60 gets you a soft, cool liner with room to move. If you want extra warmth, get a Reactor instead.
