Return policy comparison · 2026
K18 vs Kosas
Policy data verified July 24, 2026 by the Thrifle team
Winner
K18
A-
4.0 / 5.0 · Very Good
Kosas
B+
3.4 / 5.0 · Good
The verdict
K18 has the more generous return policy in 2026, grading A- (4.0/5.0) against Kosas's B+ (3.4/5.0). It wins 1 of 5 scoring axes; the biggest gap is the return window: 90-day window (above average) versus 30-day window (industry standard).
Score breakdown
Five axes, 5.0 points total — the same deterministic grader behind every Thrifle policy page.
K18Kosas
Return window · worth 2.0
Restocking fee · worth 1.0
Return shipping · worth 1.0
Holiday window · worth 0.5
Transparency · worth 0.5
Key terms side-by-side
| K18 | Kosas | |
|---|---|---|
| Return window | ✓ 90 days (direct website purchases only) | 30 days (full-size items, kosas.com orders only) |
| Free returns | Yes | Yes |
| Restocking fee | None | None |
| Return shipping | — | Free returns on full-size products ordered directly from kosas.com |
| Holiday extension | None published | None published |
| Non-returnable | Products bought at partner salons (must go back to that salon, not K18 directly) | Samples (final sale), items purchased from retail partners (Sephora, Ulta, etc. must go through that retailer) |
| Watch-out items | — | — |
K18 tip
This generous 90-day window only covers orders placed directly on k18hair.com — if you bought it at your salon, K18 corporate won't take it back, you have to go through the salon itself.
Kosas tip
Buy from kosas.com directly if you want return flexibility — anything picked up at Sephora or Ulta has to be returned through that retailer's own policy instead, not Kosas.
Frequently asked questions
Who has the better return policy, K18 or Kosas?
K18 has the more generous return policy in 2026, grading A- (4.0/5.0) against Kosas's B+ (3.4/5.0). It wins 1 of 5 scoring axes; the biggest gap is the return window: 90-day window (above average) versus 30-day window (industry standard).
What is K18's return window?
K18's return window is 90 days (direct website purchases only).
What is Kosas's return window?
Kosas's return window is 30 days (full-size items, kosas.com orders only).
Does K18 or Kosas offer free returns?
K18: Yes. Kosas: Yes.