What Sundays Made Fabric Is Actually Doing While Your Baby Sleeps

Written by Jessica Parsons

A sleeper looks simple from the outside — one piece of fabric, one zip. But it's actually working through three very different moments every single night: the second it goes on, warm and just-bathed; the middle of the night when temperature and skin comfort matter most; and 30-plus washes down the road, when it's still doing its job. We built Lulluna™ around all three, not just the first one.

Moment one: what it's actually made of

Lulluna™ starts as wood, mostly eucalyptus, sometimes spruce, beech, or birch, grown specifically to become fiber, not repurposed from furniture scraps or forestry byproducts. The wood pulp is dissolved and respun into TENCEL™ Lyocell fiber by Lenzing AG, an Austrian fiber producer that's been refining this exact process for decades.

We picked a tree-based fiber over a synthetic one because of what happens at the growing end, not just the wearing end. More than 99% of Lenzing's wood and dissolving wood pulp comes from forests certified by FSC® or PEFC, two of the strictest third-party forestry certification systems in use globally, and Lenzing has earned Canopy's top "Dark Green Shirt" ranking in its Hot Button Report, an independent audit built specifically to catch sourcing from ancient or endangered forests. The manufacturing itself runs as a closed loop, recovering and reusing more than 99% of the water and solvent involved instead of sending it downstream.

None of that is our claim to make — it's Lenzing's, third-party audited. We just get to build on top of it.

Moment two: staying cool, staying clean

This is the part that actually matters at 2am: lyocell fiber absorbs roughly 50% more moisture than cotton, pulling it inward through nanoscale channels in the fiber itself rather than leaving it sitting on the surface against skin. Less moisture sitting against skin means less trapped heat — so instead of waking up to an overheated, sweaty baby, the fabric is working to keep them at a steadier, cooler temperature through the night.

That same moisture management also affects bacterial growth, which is worth knowing when a fabric spends eight-plus hours against a baby's skin every single night. A clinical trial registered with the U.S. National Institutes of Health, comparing TENCEL garments to standard cotton in children with moderate-to-severe eczema, cited industry data showing lyocell can support up to 2,000 times less bacterial growth than polyamide, and meaningfully less than cotton or polyester. We're not suggesting Lulluna™ treats anything — we're pointing out that keeping moisture (and the bacteria that thrive in it) away from skin is exactly what a fabric touching a baby all night should be doing.

There's a physical reason lyocell also just feels different against skin straight out of the package: its fiber cross-section is smooth and round, versus cotton's more irregular, ribbon-like shape, which is part of why it needs no breaking-in period to feel soft.

Moment three: 30-plus washes later

Soft fibers and durable fibers aren't automatically the same thing, and lyocell on its own has very little stretch. So like most brands working with this fiber, Lulluna™ isn't pure lyocell — it includes a small percentage of spandex specifically for recovery, so the fabric snaps back into shape after a full night of movement, a wash cycle, or a very determined toddler instead of gradually bagging out at the knees and cuffs. This particular pairing, TENCEL™ Lyocell as the base, a touch of spandex for stretch, is one of the most common blends in the fiber's whole product category; it's the same combination you'll find in Allbirds' TENCEL apparel, Huha's liners, and plenty of the other TENCEL-based pieces from the brands below. 

The upside of that trade-off shows up wash after wash: the fabric keeps its shape and its softness instead of thinning out or pilling, which is exactly what lets a favourite sleeper get handed down to a little sibling or a cousin down the line: still soft, still holding up, just with a little more history in it.

We're not the only brand betting on this fiber

TENCEL™ isn't obscure, it's just quiet. It shows up in some of the biggest apparel names Canadians already shop, including four brands built right here in Vancouver:

• Tentree runs much of its loungewear and everyday basics on TENCEL™ Lyocell, citing its smaller water and land footprint.
• Huha builds its underwear liners on a TENCEL™ Lyocell base for the same moisture and comfort reasoning.
• Allbirds built an entire footwear line, Tree, around TENCEL™ Lyocell sourced from eucalyptus (citing 95% less water use than cotton!) before expanding the fiber into apparel.
• Patagonia has worked with Lenzing for years, using TENCEL™ Lyocell and modal across shirts, dresses, and travel pieces.
• Lululemon uses lyocell across several of its travel and lifestyle lines for its breathable, moisture-wicking properties.
• Kit and Ace, founded by members of the same Vancouver family behind Lululemon, has built lyocell blends into its easy-care, all-day fabrics.

Four Vancouver-founded brands, independently, landing on the same fiber, and often the same TENCEL™-plus-spandex blend, for the same reasons. 

The short version

Lulluna™ isn't one ingredient doing everything. The lyocell handles moisture, breathability, and skin comfort. The spandex handles shape and lifespan. Together, that's the fabric behind a slow, unhurried Sunday, which, if you're a parent, is worth more than almost anything else we could put a label on.