Kiierr302 Ultra Flex Laser Cap

5.7
Usability6.4Social5.0

16th of 30 we've scored in Laser Hair Growth Caps & Helmets

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6.4
SVT SCORESRead review

302-laser flexible cap, 6 minutes a day; listed under a clearance that describes only Kiierr’s 148 and 272.

$1,799

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SKU: KIIERR-302-ULTRAFLEX Category: Brand:

Usability

Usability

Usability Score
302 Lasers, Listed Under A Filing For 148 And 272

The 302 Ultra Flex is Kiierr's flexible 302-laser cap: 302 diodes at 650 nm, 1,510 mW in total by Kiierr's figure, for continuous 6-minute sessions every day, with sensors that keep it off until it is on a head. Its maker, Cosmo Far East, lists it with the FDA as the KIIERR-302 under K181878, Kiierr's 2018 clearance, which describes only the 148- and 272-diode caps on a 30-minute schedule, so it scores 2 on verification. Cosmo's own later clearance, K252325 (2025), describes a 302-diode cap at 650 nm under Cosmo's model name, but no listing places the Kiierr 302 under it. No measurement of its output has been published. At $1,799 it is $600 above the 272 Premier and $400 below the 312 DualWave, which adds 808 nm lasers. The warranty is 2 years.

PROS
  • 302 lasers at 650 nm, 1,510 mW total per Kiierr
  • 6-minute daily sessions with an on-head sensor and auto-off
  • Flexible cap, cordless
  • Fits heads 23.5 to 24 in, per Kiierr's spec tab
CONS
  • Listed under K181878, which describes only the 148 and 272
  • No output measurement published
  • $600 more than the 272 Premier
  • 2-year warranty
  • Guarantee refunds keep a 25 percent fee
  • Kiierr's stored description still gives 30 minutes every other day

The Kiierr 302 Ultra Flex is a flexible laser cap with 302 diodes at 650 nm, which Kiierr rates at 1,510 mW in total, worn under the included ball cap. It runs continuous 6-minute sessions every day from a rechargeable battery pack, uses sensors so it only switches on when it is on a head, and turns itself off at the end. Kiierr sizes it for heads 23.5 to 24 inches around and covers it for 2 years, with the 7-month money-back guarantee and its 25 percent fee.

Social Scores

Social Scores

Social Score
Brand-level

Kiierr is the brand of Kiierr International LLC of Tooele, Utah, as its terms give the company, and it sells through kiierr.com, a second storefront at kiierrhealth.com and its own Amazon store. Kiierr holds 4.4 from 352 Trustpilot reviews on kiierr.com (TrustScore shown as 4.5), split 75 percent five-star against 13 percent one-star, with 141 posted in the last 12 months; the profile has been claimed on a paid subscription since March 2023, Trustpilot marks it as not having invited customers recently, and the company replies to 30 percent of negative reviews, typically within a week. Most recent five-star entries are short notes on fast shipping, ease of use and named support staff, while the 2025-2026 one- and two-star reviews center on refunds refused under the 7-month guarantee for missing the 45-day registration window, orders that sat unshipped for weeks without tracking, a cap whose inside circumference runs about 22 inches against the advertised 23.5, a battery that died at 10 months with a $24.95 charge for the warranty replacement, a warranty repair the owner was billed for, and email-only support with no working phone line. BBB lists the company as Kiierr International, LLC (Salt Lake City, UT) with an A+ grade, no accreditation and 24 complaints in three years, 21 answered and 3 resolved, five of them closed in the last 12 months; the complaints concern guarantee refunds left unprocessed, warranty emails going unanswered, caps too small to wear and a $300 charge on a size exchange that Kiierr later waived, and BBB's own customer reviews average 1.44 from 9, eight of them one-star. SmartCustomer (formerly Sitejabber) lists kiierr.com at 2.0 from 2 reviews and flags it as not collecting reviews, ConsumerAffairs carries no Kiierr page, the second shop domain kiierrhealth.com has no Trustpilot profile, and FDA's recall and adverse-event databases hold no Kiierr entry; the one federal suit on record is Capillus's 2019 trademark claim against Kiierr, voluntarily dismissed that August. The guarantee refunds a cap returned 210 to 240 days after delivery minus a 25 percent service fee, waived only for owners who registered a before photo within 45 days and kept seven monthly date-stamped photos or videos; kiierr.com's own review widget (4.5 from 2,145 on the 272 Premier page), its FrontrowMD clinician panel (1,266 clinicians) and its '100,000+ happy customers' line are figures no pool counts, and the one Amazon cap listing reads 3.8 from 107. Kiierr sells its caps through kiierr.com, kiierrhealth.com and its own Amazon store; its two Walmart listings are out of stock with one rating between them, and no other US retailer carries the caps, so no retailer review file reaches the ten-review floor.

Additional information

Specification: Kiierr 302 Ultra Flex Laser Cap

Red Light Therapy Specifications
Device Type

Hair cap

Wavelengths

Red (620-680 nm)

Irradiance Claimed

Not published

Irradiance Measured

Not measured

FDA Status

Registered or listed only

Safety Listing

None verifiable

Power Source

Detachable battery pack

Session Length

5-10 min

General Specifications
Warranty

2 Years

Dimensions

Not published

Weight

Not published

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