HigherDOSE Infrared Sauna Blanket V4 Review (UK 2026)

The headline feature is the wrap. Unlike fixed-shape bag blankets, the V4 is a flat 180 x 180cm sheet you fold around yourself, which suits a wider range of body sizes and lets you wrap the arms in or out. It runs on far infrared up to 80°C with a one-hour timer, and uses a non-toxic PU leather outer over amethyst and tourmaline crystal, charcoal and clay layers.

Those crystal and charcoal layers are where the marketing outruns the evidence. There is no good data that amethyst or charcoal meaningfully changes the infrared experience - the heat does the work. Treat them as a neutral extra, not a reason to pay more. For the wider category context, see our best infrared sauna blanket comparison.

This is the V4's strongest genuine advantage. EMF (electromagnetic field) exposure is the most common worry with heated blankets, and HigherDOSE is one of the few brands that publishes third-party EMF test data rather than just claiming "low EMF" on the box. Whether or not you consider blanket EMF a real health concern - the evidence that low-level exposure is harmful is weak - the transparency is a legitimate trust signal that most rivals do not match. If EMF transparency matters to you, this is the blanket that earns it.

Value is the V4's weak point. At £699 it sits at the top of the market, and cheaper blankets deliver a very similar far-infrared experience for £150-£300 less. What the extra money buys is the brand, the full-wrap format, and the resale value - HigherDOSE blankets hold their price on the used market better than any rival, so if you might sell it on, some of the premium comes back. If you simply want the cheapest route into infrared heat at home, it is not this. If you want the known quantity with the best resale, it is.