Product image supplied by the brand
In this guide
HALO sells its cotton SleepSack as "Wearable Blanket 100% Cotton TOG 0.5" at $34.99 in Heather Gray, with Small, Medium, Large and Extra Large variants at one price. The Medium checked here is SKU 10760, and HALO's chart places it at 6-12 months, 26-30 inches and 16-24 pounds. The page also carried a "20% off at Checkout" badge on 2026-09-11 against an unchanged regular price.
This is a different product from the SwaddleStretch newborn swaddle covered in a separate review, which HALO also prices at $34.99. The wearable blanket is sleeveless and zips from the bottom; HALO's own glossary text on the same page draws the line: a sleepsack "allows the baby to have their arms free and is not meant for swaddling". Everything below comes from HALO's page and its size-chart image, quoted where the wording matters.
Our verdict
A basic, well-documented cotton sack for a baby in the 16-24 pound band; buy it for the published sizing and the 0.5 TOG rating, and read HALO's own safety bullets as the whole of its safety guidance.
- A good fit for
- A baby past the swaddle stage whose weight and length both land inside HALO's Medium band, sleeping in a room HALO puts in the warm end of its TOG chart.
- We would skip it if
- The room runs cooler than the mid-70s, the baby sits at the edge of two size bands, or you expect printed sleep-position guidance on the listing itself.
Reasons to consider it
- Sizing is published by weight and length, not just age: Medium covers 26-30 inches and 16-24 pounds
- 100% cotton at 0.5 TOG with a bottom-opening zipper and a fabric zipper cover, per HALO's feature bullets
- Care is plain: cold gentle machine wash, tumble dry low, no ironing or dry cleaning
The compromises
- HALO gives two room-temperature ranges for the same 0.5 TOG rating on one page: 75-77°F in its TOG table and 68-77°F in its picker widget
- Adjacent sizes overlap by several pounds, so a 17-pound baby fits both Small and Medium on paper
- HALO cannot say whether an embroidered or plain-print version will arrive, and the page prints no sleep-position wording
What we have not verified: The asterisk on HALO's "#1 SleepSack Brand*" claim has no footnote in the captured page text, so its basis is unknown. Fabric weight, shoulder opening width and zipper length are not published. The listed 1 lb per variant is a Shopify shipping weight, not a garment weight. No warranty statement is printed on the listing.
The things in this guide
A closer look at the products, who they may suit, and what to check before buying.
SleepSack Wearable Blanket 100% Cotton TOG 0.5 · Medium
HALO publishes weight and length limits for each size and a numeric TOG rating, which is more than most wearable blankets state, and the cotton care routine survives frequent washing.
Before you buy: Only for rooms HALO's table matches to 0.5 TOG; the two temperature ranges HALO prints do not agree at the cooler end, and the page prints no guidance beyond replacing loose blankets.
Price checked September 11, 2026. Retailer prices can change.Sizing By Weight And Length
HALO's chart gives five bands: NB at 0-3 months, 19-23 inches and 5-10 pounds; Small at 0-6 months, 23-26 inches and 10-18 pounds; Medium at 6-12 months, 26-30 inches and 16-24 pounds; Large at 12-18 months, 30-35 inches and 22-28 pounds; Extra Large at 18-24 months, 35-40 inches and 26-36 pounds. The Heather Gray cotton version lists Small through Extra Large only. Having weight and length on the chart matters more than the month labels, because a long, light baby and a short, heavy one at the same age can land in different sacks.
The bands overlap on purpose. A baby at 17 pounds and 26 inches fits both Small and Medium; one at 23 pounds and 30 inches fits both Medium and Large. HALO's page pushes toward the larger size with the line "Extra roomy; size up less" and a feature bullet reading "Extra long and roomy for extended use". Taken together, the guidance favors buying Medium once the baby clears 16 pounds and 26 inches, then staying in it until the 24-pound or 30-inch limit is reached. HALO does not publish the finished sack length in inches, so the fit at the bottom hem cannot be checked from the listing.
Fabric, TOG And Room Temperature
The fabric line reads "100% cotton", the feature bullet calls it "soft, breathable and gentle on skin", and the safety block opens with "0.5 TOG". HALO defines TOG on the same page as "the warmth rating used for baby sleepwear" that "measures how well a fabric traps warm air". Its TOG Temperature Guide pairs 0.5 TOG with "75°F to 77°F — Summer / warm rooms", then steps up through 1.0 TOG at 72-75°F, 1.5 TOG at 68-72°F, 2.0 TOG at 64-68°F and 3.0 TOG at 61-64°F. On that table, this sack is the lightest layer HALO makes.
A second widget on the same page contradicts the table: it reads "This product is perfect for 68°F to 77°F" for the 0.5 rating. The 68°F floor belongs to HALO's 1.5 TOG row, so one of the two statements is loose. For a nursery held in the low 70s, the table points to a 1.0 or 1.5 TOG sack and the widget says this one is fine; HALO has not reconciled them. Fabric weight in ounces per yard is not stated, and the 454 g weight in the product JSON is a per-variant shipping figure that Shopify applies to every size, so it is silent on the garment. HALO also notes that from 2024 SleepSacks "are no longer embroidered" and that it "cannot guarantee which version you will receive" while old stock sells through.
Zipper And Safety Wording
HALO lists "Inverted Zipper" among the four headline features, and its description ties the zipper to "easy diaper changes", meaning the sack opens from the bottom so the top stays closed. A feature bullet adds a "Zipper cover to prevent irritation", and the care text asks that the zipper be closed and the sack turned inside out for washing. Zipper length, pull type and whether the pull is covered at the neck are not published. The IHDI line is quoted here as printed: "Hip healthy; approved by the International Hip Dysplasia Institute". HALO gives no certificate number or date for that approval on the page.
The safety block contains exactly three bullets: "0.5 TOG", "Replaces loose blankets for better, longer, safer sleep", and "Imported". No sleep-position instruction, no crib-setup wording and no reference to a named standard appears anywhere in the captured page text, and this review adds none. The nearest thing to guidance is HALO's glossary paragraph, which says a sleepsack "is worn over the baby's sleepwear and provides warmth and comfort while ensuring there are no loose blankets that could pose suffocation risks" and that sleepsacks "are suitable for babies who can roll over". A buyer wanting printed positioning guidance will have to get it from the packaging or elsewhere, since HALO's web copy does not supply it.
Care, Origin And Price
Care is a short list: "Machine wash cold on a gentle cycle with like colors. Use only non-chlorine bleach if needed. Tumble dry low. Do not iron or dry clean." HALO asks for a wash before the sack is worn and recommends closing the zipper and turning it inside out. Nothing in that routine needs special handling, which is the point of a cotton sack that gets laundered several times a week. Origin is given as one word, "Imported", with no country named. No warranty text is printed on the listing, so any coverage beyond returns is unknown from this source.
The price is $34.99 for every size, the same figure HALO charges for its SwaddleStretch newborn swaddle. A "20% off at Checkout" badge sat on the page on 2026-09-11 while the regular and compare-at prices both stayed at $34.99, so the discount applies in the cart and could end without the page changing. Standard shipping is free for orders over $30, so a single sack clears the threshold; orders under $30 pay a flat $6.95, and processing runs 1-3 business days. Returns are accepted for 30 days from shipment on halosleep.com purchases, provided the item is "unworn, unwashed, and in their original packaging", which rules out returning a sack once it has been slept in.
When To Skip
Pass on the 0.5 TOG cotton version if the nursery sits below the mid-70s and you take HALO's own table at face value; HALO's 1.0 TOG micro-fleece and 1.5 TOG bamboo sacks are the ones its chart assigns to cooler rooms. Pass on Medium specifically if the baby is under 16 pounds or 26 inches, because the chart starts Small at 10 pounds and the roomy cut HALO advertises works against a small baby. A baby already at 23 pounds and 30 inches will outgrow Medium quickly, and Large starts at 22 pounds.
Also skip it if a printed embroidery or a specific version matters to you, since HALO states it cannot promise which one ships until old inventory is gone. Buyers wanting sleep-position wording, a named safety standard or a warranty statement on the listing will not find them here; HALO's web copy limits itself to the loose-blanket line and the IHDI acknowledgement. For those buyers the packaging insert, which was not read for this review, is the only remaining place for HALO to print more.
How we put this together
Built from the product pages and listings below, without test scores or results we have not measured. Specifications and prices change, so check the original page for the exact model, current price, delivery, and returns.
- HALO: Wearable Blanket 100% Cotton TOG 0.5, Heather Gray (opens in a new tab)
- HALO: SleepSack Wearable Blanket Sizing chart (image linked from the listing) (opens in a new tab)
- HALO: Shopify product JSON for the Heather Gray cotton wearable blanket (opens in a new tab)
