How we ranked three half helmets
Shell construction, first. This is where the three separate most clearly and where the price tags are least informative. The Sena Cavalry 2 and the LS2 Bagger both use a fiberglass composite shell over EPS; the HJC IS-Cruiser, the middle-priced helmet, uses an injected advanced-polycarbonate composite. A laid-up shell is stiffer per gram than an injected one, which is the direct cause of the weight order below. Our shell materials guide explains what each construction actually is.
Published weight, with the reference size where there is one. Sena publishes 950 ±30 g for a size Medium, which is both the lightest figure and the only one of the three that states the size it applies to. LS2 publishes about 1,012 g. HJC’s US listing gives 2.64 lb, roughly 1,197 g, with no reference size — and that makes the IS-Cruiser the heaviest helmet here by about 250 g while covering no more of your head.
Does it solve glare? One of three does. The IS-Cruiser’s integrated HJ-V4 pull-down shield is the reason to buy it, and the reason it beats the Bagger despite being heavier and more expensive. Riding into low sun with no shield and no visor is the most common half-helmet regret.
Does it solve comms? One of three solves it properly and one makes it possible. The Cavalry 2 has Mesh Intercom 3.0 built in, quoted at up to 0.8 miles bike-to-bike in open terrain with Group Mesh for up to 24 participants, plus Wave Intercom over cellular data when riders spread out beyond mesh range. The Bagger gives you speaker pockets and a hidden wiring channel. The IS-Cruiser publishes neither.
Shell sizes, which is where all three are weak. The Bagger is built from two shell sizes across an XS–2XL run, so the extremes carry more EPS than shell. This is normal in the category and it is still a cost — see our shell sizes guide for why it matters more than most spec sheets admit.
What you are actually giving up
Be specific about it rather than gesturing at “less safe”. A half helmet gives up the chin bar, which is the structure protecting the jaw and lower face — a frequent impact region in motorcycle crashes and the reason the full-face exists. It gives up the face shield, so your eyes are protected by whatever you remembered to bring, and in rain or at night that becomes a visibility problem rather than a comfort one. It gives up the seal, which costs you noise, warmth and the ability to ride in weather.
What it does not give up is the certification over the area it does cover. All three of these are DOT-certified, and a certified half shell manages crown impacts to the same required standard as any other certified helmet. None of them states ECE or Snell — no half helmet in our registry does — so if certification depth is what you care about, that is a reason to look at our safest-helmet ranking instead, where the entries are full-face and modular because that is where the certifications are.
Match the pick to your riding
Group rides, cruiser, you want music and intercom: the Sena Cavalry 2. It is the best-built helmet here and the only one where comms is not an afterthought — 18 hours of talk time, Bluetooth 5.2, integrated speakers and mic, over-the-air firmware updates. Two honest costs: it is several times the price of a plain half helmet, and the electronics are not removable, so when the hardware dates it dates inside the helmet. If you would rather pair a separate unit with a better shell, our mesh intercom ranking is the other route.
Commuting into low sun, or any ride where glare is the problem: the HJC IS-Cruiser. The pull-down sun shield is the right feature at the right price, the Nylex liner is removable and washable rather than glued in, and the XS–2XL run on a 54–63 cm span fits a wider range of heads than most half helmets. It is the heaviest helmet here and it is polycarbonate, and at this price those are reasonable trades for the shield.
Cheapest sensible lid, and you already ride in sunglasses: the LS2 Bagger. A fiberglass composite shell at a published 1,012 g for under $100 is a genuinely good spec sheet, and the zip-off neck skirt plus speaker pockets with a hidden wiring channel are features the IS-Cruiser does not have. What you give up is any eye protection at all beyond the three-snap peak.
Not sure a half helmet is right for you? Read our cruiser helmet ranking, which takes the same riding position and answers it with full-face and modular helmets instead — including one that converts to open-face, which is the way to have this argument with yourself only once.
