# Bike helmets with adjustable fit for a range of head sizes Which bike helmets offer a wide range of head sizes? No checked fact states a head\-size range that these helmets cover\. The closest matches are the fit adjustments and size figures below\. Banwood Eco Helmet: The Australian maker page lists weight as 355 g \(the UK maker page says 280 g and the store says 0\.78 lbs; the sources disagree\), and mentions dial\-fit, recycled chinstrap and ventilation\. The helmet height can be adjusted in three steps\. The Australian maker page says ages 3\+, head circumference 50–54 cm, and Australian/New Zealand Standards certified; the UK maker page gives ages 2–7 and 52–56 cm, so the age and size figures disagree\. Doona Liki Helmet: The helmet has a dial\-fit adjustment system for a customized and secure fit\. The maker says the helmet is for learning to ride the Liki Trike and for the next size of bicycle until age 4\. Banwood Classic Helmet: The helmet height is adjustable in three steps\. The XS size is 48–52 cm, approximate age 18 months to 4 years\. ### 1. [Banwood Eco Helmet](/products/ucp/modernnursery-com/14733684736366) (sold by modernnursery\.com) The Australian maker page lists weight as 355 g \(the UK maker page says 280 g and the store says 0\.78 lbs; the sources disagree\), and mentions dial\-fit, recycled chinstrap and ventilation\. - Fit adjustment: The helmet height can be adjusted in three steps\. (manual) - Size or age guidance: The Australian maker page says ages 3\+, head circumference 50–54 cm, and Australian/New Zealand Standards certified; the UK maker page gives ages 2–7 and 52–56 cm, so the age and size figures disagree\. (guide) ### 2. [Doona Liki Helmet](/products/ucp/megababiesusa-com/8104443183358) (sold by megababiesusa\.com) The helmet has a dial\-fit adjustment system for a customized and secure fit\. - Fit adjustment: The helmet has a dial\-fit adjustment system for a customized and secure fit\. (guide) - Size or age guidance: The maker says the helmet is for learning to ride the Liki Trike and for the next size of bicycle until age 4\. (guide) ### 3. [Banwood Classic Helmet](/products/ucp/modernnursery-com/6545851351140) (sold by modernnursery\.com) The helmet height is adjustable in three steps\. - Fit adjustment: The helmet height is adjustable in three steps\. (manual) - Size or age guidance: The XS size is 48–52 cm, approximate age 18 months to 4 years\. (guide) ## Also cited in the text - Banwood Eco Helmet, weight and features: The Australian maker page lists weight as 355 g \(the UK maker page says 280 g and the store says 0\.78 lbs; the sources disagree\), and mentions dial\-fit, recycled chinstrap and ventilation\. (guide) Every value in the table is a fact RoboTrunk checked, linked to the page it came from\. A dash means no checked fact fills that cell\. Prices and stock change, so this page prints neither: each product name links to its RoboTrunk page, which shows them live\. Written 2026-10-22T12:14:15.176Z. This page is published by RoboTrunk, a store built for shopping agents. The store named on this page sells the product and ships it. RoboTrunk is not the seller and never holds the money. Buying works in one path. RoboTrunk's tools prepare a checkout at that store, then hand back a short-lived link. The person approves the total; once RoboTrunk has checked the store's total against it, the person is given the checkout link to tap in their own browser, or, if the person prefers and gives permission, their agent may open the link and finish there, and payment always happens on the store's own checkout page. RoboTrunk never takes the payment or sees a card. Where the rest of this site is: - /agent/story.md is what RoboTrunk is and how it works, in full. - /agent/tools.json is every tool, its arguments and its answers. - /agent/merchants is every store you can buy from through RoboTrunk. - /products/ucp is every store's indexed products. - /products/search is one search across every store, in plain words. - [What RoboTrunk is](/agent/story.md) - [Every tool, in your browser through WebMCP](/agent) - [The tools and how to call them](/agent/tools.json) - [The stores you can buy from](/agent/merchants) - [Every store's products](/products/ucp) - [Search every store at once](/products/search)