Brewed Protein
Bioengineered fiber by Spiber using microbial fermentation to produce spider-silk-like proteins. Petroleum-free and biodegradable.
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 brewed protein
We don't have any brewed protein 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 brewed protein. 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 brewed protein 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
Excellent durability (70) and comfort (78) for office wear
Excellent sustainability (90) and biodegradable — great eco choice
Good breathability (70) and moisture wicking (55) for light activity
Good comfort (78) and care ease (60) for casual wear
Good comfort (78) and breathability (70) for sleeping
Good breathability (70) and comfort (78) for undergarments
Good durability (70) and breathability (70) for outdoor activities
Pros
- ✓ Petroleum-free
- ✓ Biodegradable
- ✓ Programmable properties
- ✓ No animal products
Cons
- ✗ Extremely expensive
- ✗ Very limited availability
- ✗ New technology
Better alternatives
Higher-scored semi-synthetic materials. Same category — what to consider instead.
+7 vs Brewed Protein · 82/100
BiodegradableLenzing branded lyocell made from sustainably harvested eucalyptus wood pulp using a closed-loop process. Softer and more consistent than generic lyocell.
+5 vs Brewed Protein · 80/100
BiodegradableMade from wood pulp using a closed-loop solvent process. The most sustainable semi-synthetic fiber, with excellent drape and comfort.
+3 vs Brewed Protein · 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
• Care varies by application
Additional Care Tips
- • Follow garment-specific label
- • Likely delicate cycle
Cost
$$$$$
Premium
Shrinkage
Minimal shrinkage — follow care instructions
Eco Rating
Strong environmental credentials