Milk Fiber
Regenerated protein fiber made from casein (milk protein), typically from waste milk unfit for consumption. Has a silky feel but moderate durability.
Material Score Breakdown
7-axis material rubric, not a garment verdict — see disclosure below.
How long the fabric lasts with regular use
Softness, feel against skin, wearability
Air flow and ventilation
Heat retention and insulation
Ability to pull sweat away from skin
Environmental impact of production and disposal
How easy it is to wash, dry, and maintain
Products with milk fiber
We don't have any milk fiber products in our catalog yet — it's a rare semi-synthetic fiber. Here are top-rated semi-synthetic alternatives:
What this score doesn't measure
This is a material rating, not a verdict on any specific garment made from milk fiber. The axes above are research-backed averages for the fiber itself.
- ×Construction. Yarn staple length, weave / knit structure, stitch count, finishing. Identical fiber, very different garments.
- ×Fabric weight (GSM). A 140 GSM tee and a 220 GSM tee made of the same milk fiber feel and last very differently.
- ×Dye + finishing chemicals. Beyond the three we flag (PFAS, formaldehyde, antimony), dozens of textile finishes aren't modelled.
Best For
Good breathability (65) and moisture wicking (50) for light activity
Good comfort (75) and breathability (65) for sleeping
Good sustainability score (60)
Detailed Use Case Scores
Pros
- ✓ Very soft and silky hand feel
- ✓ Naturally contains amino acids beneficial for skin
- ✓ Good moisture absorption
- ✓ Upcycles waste milk from dairy industry
Cons
- ✗ Low wet strength — weakens significantly when damp
- ✗ Not suitable for machine washing without care
- ✗ Production process requires chemical crosslinking agents
- ✗ Niche material with very limited availability
Better alternatives
Higher-scored semi-synthetic materials. Same category — what to consider instead.
+24 vs Milk Fiber · 82/100
BiodegradableLenzing branded lyocell made from sustainably harvested eucalyptus wood pulp using a closed-loop process. Softer and more consistent than generic lyocell.
+22 vs Milk Fiber · 80/100
BiodegradableMade from wood pulp using a closed-loop solvent process. The most sustainable semi-synthetic fiber, with excellent drape and comfort.
+20 vs Milk Fiber · 78/100
BiodegradableAn ultra-fine variant of modal made from beech tree pulp, with fibers significantly thinner than silk. Exceptionally soft and lightweight, it is the premium choice for high-end underwear and loungewear.
Care Guide
Special Notes
• Very delicate — hand wash recommended
• Air dry flat
Additional Care Tips
- • Hand wash in cool water (20°C/68°F) with gentle detergent
- • Do not wring or twist — press water out gently between towels
- • Lay flat to dry away from direct sunlight
- • Iron on low heat with a pressing cloth if needed
- • Store folded — avoid hanging as wet fibers stretch permanently
Cost
$$$$$
Mid-range
Shrinkage
May shrink 2-5% — wash cold
Eco Rating
Moderate impact — consider eco alternatives