Many customers report visible hair regrowth and sturdy build quality with consistent use. Support teams and the online ordering experience often earn praise for quick, responsive help. Some reviews point to practical snags, including small sizing, battery pack failures, shipping delays, and unclear warranty or registration steps.
Examples from available reviews (Dec 2021 – Mar 2026).
After six months the cap significantly improved hair density for this user.
“It has significantly improved my hair density after six months of use.”
Order didn't fit and company failed to provide replacement or refund.
“they said they would send me a larger one and they haven’t”
Ordering had delays and warranty confusion despite product quality.
“It took a little bit of time to get my cap”
Battery failed after ten months and user discarded the cap due to no results.
“The battery died 10 months later.”
Many reviews describe fast, helpful support, including cases where the company sent free replacements. A few reviewers say promised replacements or refunds never arrived, and some describe more serious breakdowns in service.
Several reviewers point to the short daily routine and accessible starting price as reasons they see good value. Fewer users mention added warranty or registration requirements that lower the value in their view.
Most users say the device feels comfortable and fits easily into a brief daily routine. Some reviews mention fit issues and a battery pack that feels bulky or hard to take on the go, which cuts into convenience.
Many reviews mention noticeable regrowth, thicker hair, and solid construction over long-term use. A minority report parts failing, such as a dead battery, or say they saw no change even after extended use.
Several customers highlight clear site details, smooth ordering, and tracking updates they could rely on. Others report late deliveries or uncertainty about warranty registration and required paperwork.
Experiences lean positive, especially for users who report regrowth and higher confidence. Negative feedback clusters around practical issues: sizing, battery life, shipping delays, and warranty handling.
For each review, the core experience based on original source reviews.
Sources: Trustpilot (40) · Collected.reviews (1) · Quotes shortened · As of: March 2026
Ordering had delays and warranty confusion despite product quality.
“It took a little bit of time to get my cap”
Device is easy to use and supportive information helps maintain commitment.
“Easy to use and supportive information available to keep you accountable to your commitment.”
Website was clear and shipping was quick.
“Website well laid out and understood.”
Reviewer noticed some new hair growth from stubble.
“Have noticed stands growing and seeing a little more growth from stubble”
Reviewer praises high product quality and outstanding customer service.
“HIGH QUALITY PRODUCTS AND OUTSTANDING CUSTOMER SERVICE”
Cap is convenient to use and reduced shedding within the first week.
“I noticed less shedding in the first week of use”
Product matched description and works as intended with good fit.
“Product came as advertised.”
Long-term use produced noticeable new hairs when used consistently.
“I can honestly say it works for me when I’m consistent.”
After six months the cap significantly improved hair density for this user.
“It has significantly improved my hair density after six months of use.”
Product fit was small and larger size required extra cost.
“head gear does not fit well (small)”
New cap arrived on time with top workmanship and components.
“Workmanship is top!”
User feels the product dramatically improved their hair confidence.
“This is a game changer!”
Long-term use produced satisfying and lasting hair results.
“I have been using the Kierr cap since early 2019.”
Tiny baby hairs appeared within one week after starting treatment.
“I have noticed tiny baby hairs where there hasn't been hair for a while.”
Combination treatment produced real regrowth and improved confidence.
“For the first time ever, I am actually seeing real regrowth.”
Company was consistently present and kind throughout the process.
“they were always there and always kind.”
Product works but warranty and registration details were costly and unclear.
“You need to register with a picture not only for the money-back guarantee, but also the warranty!!”
Affordable model requires just six minutes daily and is easy to use.
“Good price point, 6 minutes a day”
Initial product dispatch and communication have been good so far.
“the initial sending of product and communication has been really good”
Product arrived promptly and tracking information was very good.
“I received the product promptly”
Product may have slowed hair loss; company provided supportive customer service.
“They stand by their product.”
Company was responsive and supportive before starting treatment.
“Kiierr has been wonderfully responsive and supportive.”
Product is easy to use and comes with a growth guarantee.
“Product is easy to use.”
Order didn't fit and company failed to provide replacement or refund.
“they said they would send me a larger one and they haven’t”
Results have been slow but company was responsive about the order.
“Results have been a little slow but easy to use.”
Device is easy to use but battery pack portability is inconvenient.
“It’s pretty easy to use”
Cap produced noticeable regrowth after four months on treated spot.
“I have been using cap for 4 months and have about 1.5” of hair on the once bald spot!..”
Battery failed after ten months and user discarded the cap due to no results.
“The battery died 10 months later.”
Customer service provided a free replacement battery and resolved problem.
“she was able to get me a free battery pack replacement”
Device is comfortable and customer service was helpful with registration.
“Customer service is very helpful”
Ordering and shipping communication were clear and support was personalized.
“Very easy order process”
Cap arrived quickly and is more comfortable and convenient to wear.
“Arrived within 4 days of order.”
Delivery took 20 days due to processing delays despite advertised shipping.
“it took 20 days from the time it was ordered”
Cap arrived quickly and user reports early positive signs after two weeks.
“I have been using the cap for about 2 weeks and my wife says its already working.”
Cap arrived promptly and was ready to use with clear instructions.
“It fit and felt good.”
First use went well and user is hopeful for results.
“Just used the cap for the first time.”
Delivery was slightly delayed but company proactively updated status.
“There was a slight delay on delivery”
Device is easy to use and charge, with early signs of growth.
“Gear is easy to use and charging is a breeze.”
Ordering was easy and customer service clarified registration requirements.
“Easy online ordering.”
Company issued a full refund and sent extra vitamins to satisfy customer.
“they also went a step further by sending additional vitamins”
This page combines submitted experiences with public reviews from platforms such as Google, Trustpilot, etc. Recurring points are summarized without changing the content of reviews.
Kiierr designs and sells low-level laser therapy (LLLT) caps aimed at hair thinning. Through its online store, the company offers rechargeable cap systems, battery packs, and replacement accessories. Product pages list setup steps, technical specs, and warranty information. Kiierr provides customer support for orders and product problems and ships directly to consumers.