Purflo
Baby Sleep Bag, 2.5 Tog
7/10 overall£40.00
A sleep bag with a wide, tapered base designed to keep a baby in a safe back-sleeping position and prevent them sliding down.
The verdict
Purflo's sleep bag, priced at £40, has a wide, tapered base designed to keep a baby in the safe, flat back-sleeping position recommended by NHS guidance and stop them sliding down inside the bag. It's worth prioritising if your baby tends to wriggle down inside a standard rectangular bag, though it's pricier than more basic sleep bags at a similar tog rating.
Purflo's sleep bag is built around a specifically shaped base — wider at the top, tapering towards the feet — designed to encourage a baby to stay in the safe, flat, back-sleeping position recommended by NHS Safe Sleep guidance, rather than sliding down inside the bag overnight. It's a more deliberate shape than a straightforward rectangular sleep bag, aimed squarely at reinforcing the sleep position parents are advised to use.
Versus Tommee Tippee's Grobag, both are respected TOG-rated options at a similar 2.5 Tog weight for cooler months; the difference is mainly this shaped-base detail, which is worth prioritising if you've found your baby tends to wriggle down inside a standard rectangular bag.
Is the Baby Sleep Bag, 2.5 Tog worth it?
- Tapered base shape helps keep baby in the recommended back-sleeping position
- Breathable, TOG-rated fabric for safer temperature regulation
- Sized ranges cover a good stretch of months per bag
What are the downsides of the Baby Sleep Bag, 2.5 Tog?
- Pricier than more basic sleep bags of a similar TOG rating
- Shaped base is a smaller refinement, not a dramatic difference for every baby
- Fewer print/colour options than some mainstream brands
Specs
- Fabric
- Breathable cotton
- Sizing
- 0-6 months, 6-18 months, 18-36 months
- Base shape
- Tapered, designed to prevent sliding down
- TOG rating
- 2.5 Tog
How we scored it
Self-Soothe / Arms Freedom
Whether the design lets baby get a hand to their face to self-settle, versus fully restricting arm movement.
Not swaddle-specific, but the secure fit supports settled sleep.
Safety & Hip-Healthy Fit
Room for natural hip and leg movement and overall adherence to safe-sleep guidance.
Roomy leg space and a base shape aimed at supporting the recommended safe sleep position.
Value & Longevity
How many months of use you realistically get before baby outgrows or rolls out of it.
Good multi-month sizing brackets, at a moderate price premium.
Weighted by importance for this category — see our editorial policy for how we test.
How this review was done
We haven't used the Baby Sleep Bag, 2.5 Tog ourselves yet. This review is built from Purflo's published specifications and product information, and scored the same way as everything else on the site. We'll update it, and the badge above, once we've tested it hands-on.
How it compares
|  |  |  | |
|---|---|---|---|---|
| Price | £40.00 | £35.00 | £26.00 | £27.99 |
| Overall score | 7/10 | 7.3/10 | 7.4/10 | 7.9/10 |
| Fabric | Breathable cotton | Bamboo-cotton blend | — | — |
| Sizing | 0-6 months, 6-18 months, 18-36 months | 0-3 months (multiple sizes available) | — | By weight, roughly newborn to 6 months |
| TOG rating | 2.5 Tog | 1.0 Tog | — | — |
Frequently asked questions
How does the tapered base help keep my baby safe?+
It's wider at the top and tapers towards the feet, designed to encourage a baby to stay in the safe, flat, back-sleeping position recommended by NHS Safe Sleep guidance, rather than sliding down inside the bag overnight and out of that position.
How does Purflo compare to the Tommee Tippee Grobag?+
Both are respected TOG-rated options at a similar 2.5 tog weight for cooler months - the main difference is Purflo's shaped base, worth prioritising specifically if your baby wriggles down inside a standard rectangular bag overnight.
Is Purflo's sleep bag breathable?+
Yes - it's made from breathable, TOG-rated cotton fabric for safer temperature regulation, and the sizing ranges cover a good stretch of months per bag as your baby grows.
Is Purflo worth the extra cost?+
It's pricier than more basic sleep bags of a similar TOG rating, and the shaped base is a smaller refinement rather than a dramatic difference for every baby, so it's most worth the premium specifically for babies with a sliding-down problem.
Guides that mention this
Baby Room Temperature in Winter: UK Safe Sleep Guide
The NHS and Lullaby Trust recommend a baby room temperature of about 16 to 20°C, with overheating the bigger risk. Here is how to check the room and your baby, what to dress them in as nights get colder, and what to avoid.
Safe Sleep for Newborns: The NHS Guidance Explained
There are five safe sleep rules that meaningfully reduce SIDS risk. Here's what each one means in practice, and why the small details matter as much as the big ones.
Reviewed by
Sepehr
Software engineer, soon-to-be dad, uncle to four — the tech-obsessed half of the two of us testing this stuff. Currently building this site with my wife, ahead of our own baby arriving.