Baby Sleep Bag 1.0 TOG in TENCEL™ - Mermaids

Fewer night wakeups and longer stretches of sleep — that is what the right-weight bag buys you. At 1.0 TOG it carries most of the year, so bedtime stops being a temperature guess.

Watercolor mermaids — the soft-pastel under-the-sea pattern.

1.0 TOG. The year-round sleep bag. Built for nurseries between 69 and 75°F, the most common US bedroom temperature overnight. If you're only buying one sleep bag, this is the one.

Material. TENCEL™ Lyocell, with DuPont™ Sorona insulation for warmth without bulk. TENCEL™ is a wood-pulp fiber spun in a closed-loop process — 99% of the water and solvents get recycled back into the production line. Lenzing produces it; we buy from Lenzing directly. It's softer than cotton and holds up through multiple washes without pilling or thinning. The Sorona is a plant-based polymer fiber from corn-derived feedstock — it traps warmth at a fraction of the loft of polyester, which is how this bag stays a 1.0 TOG without feeling like a winter parka.

The print. Ivory ground with watercolor mermaids in pastel pink and peach with brown hair, peach binding.

Construction. Sleeveless. 2-way zipper that opens from the bottom so the baby stays inside the bag during diaper changes — open the bottom, change, zip up, no temperature shock. Hidden seams against the skin and a fabric guard at the zipper top for babies with eczema or sensitive skin. The neckline is engineered to fit snug at the shoulders without restricting breathing — that's the safe-sleep geometry.

Why TENCEL™ for a year-round bag. We choose the fiber by the job it has to do. A 1.0 TOG bag is worn most of the year and washed weekly, so here we use TENCEL™ Lyocell — it keeps its hand and surface through repeated washing and regulates temperature wash after wash. For our lightest warm-weather pieces — muslin swaddles, 0.5 TOG sleep bags, and crib sheets — we choose Tanboocel™ bamboo lyocell muslin, because an open muslin weave breathes best when the nursery is warm. Two premium fibers, each picked on purpose. See both in the full sleep bag range.

Independent recognition. Part of Loulou Lollipop's Good Housekeeping 2025 Parenting Award-winning sleep sack line.

Adjacent TOGs in the same print. Room running warm? The 0.5 TOG Muslin Sleep Bag in Mermaids covers 75–81°F summer nurseries. Cold nursery in winter? The 2.5 TOG TENCEL™ Sleep Bag picks up at 61–68°F.

Sizing. 0–6M (8–18 lb), 6–18M (18–28 lb), 18–36M (28–38 lb). Size to current weight. The 0–6M usually carries a baby through to the 4-month sleep regression; the 6–18M is the longest-tenured size in most households.

Care. Machine wash cold, tumble dry low. TENCEL™ takes the dryer well. Do not bleach. Do not iron the printed panels.

Certifications you can verify. OEKO-TEX Standard 100 (no harmful chemistry in the fabric). CPSC, CPSIA, ASTM (US child-product safety standards). AAP safe-sleep aligned (the pediatric guidance most parents are already following). Certified B Corp on the brand.

Browse all baby sleep sacks.

Free US shipping on orders over $65. 30-day returns on unworn, unwashed items in original packaging.

Part of the Big Dreams Sleep System. Sleepers and sleep bags in Mermaids are built to layer together through the night — same print, one system. Complete the set with the Tanboocel™ Muslin 0.5 TOG Sleep Bag and TENCEL™ Sleeper.