You already know what CFM means. Here’s the part that actually matters when you’re placing an order: real specs, a breathable-plus-UPF option, and how to check a supplier isn’t guessing.
Short answer: Mibein’s breathable knit range runs 130–190 g/m², with a UPF700+ variant available for brands that need airflow and sun protection in the same fabric. Ask for the tested air-permeability figure, not just the word “breathable,” before you order.
Key Takeaways
- Real breathable fabric specs across Mibein’s range span 130–190 g/m², with spandex options up to 13%.
- One SKU (C25319A) combines breathability with UPF700+ sun protection — a real combination most fabric lines don’t offer.
- Air permeability is tested to ASTM D737 — ask for the number, not just the claim.
- For how CFM measurement actually works, see What Is Breathable Fabric and How Is It Measured? (CFM Guide) — this page picks up from there.
Picking Up Where CFM Ends
If you haven’t already, read the CFM Guide first — it covers what breathability is and how air-permeability testing works. This page doesn’t repeat that. It’s for the point after you understand CFM, when you actually need to pick a fabric and confirm the supplier’s numbers are real.
The ASTM D737 test in practice — this is what “tested breathability” actually looks like.
Real Breathable Fabric Specs (130–190 g/m²)
| Item | Weight | Composition | Best for |
|---|---|---|---|
| P35132 | 130 g/m² | 100% Polyester | Lightest airflow option |
| S35869 | 160 g/m² | 87% Poly + 13% Spandex | Airflow with movement |
| C25319A | 165 g/m² | 100% Polyester, UPF700+ | Breathable + sun protection |
| TS25116 | 190 g/m² | 100% Polyester | Structured breathable pieces |
Breathable + UPF: One Fabric, Two Jobs
Airflow and sun protection usually get sourced as two separate problems. C25319A does both — a 165 g/m² breathable knit with a UPF700+ rating built in, rather than a topical UV finish layered on top of a standard breathable fabric. It’s a narrow combination, but a real one, useful for golf, hiking, and outdoor lifestyle collections that need both properties without doubling up on fabric development.
Breathable Fabric by Garment Type
Airflow needs differ by garment: a golf fabric needs to manage heat through a round in direct sun, a base layer needs airflow directly against skin during movement, and a hooded jacket needs to stay breathable whether the hood is up or down.
Verifying a Supplier’s Breathability Claims
“Breathable” with no number attached is a description, not a spec. Before ordering, ask for:
- The actual air-permeability figure, tested to ASTM D737 — not just the word “breathable”
- Fiber composition as an exact percentage, especially for spandex-blend options
- Whether a UPF rating (if claimed) is fiber-level or a topical finish that will fade
Need a breathable spec that fits your garment?
Send Mibein’s team your target GSM and use case — including whether you need the UPF700+ option — and we’ll recommend the right fabric.
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