Shark FlexStyle vs Revlon One-Step Volumizer
Last checked 2026-10-11.
The Shark FlexStyle HD440BK is a dryer that twists into a styler, with curlers, two brushes, a diffuser and a concentrator in the box per Shark's page, 1,600 W and an 8 ft cord. The Revlon One-Step Volumizer is a hot-air brush with a fixed 2.8 in oval barrel and 1100 W, per Revlon's page and the listing. Shark gives a 2-year limited warranty; Revlon's page gives a 4-year limited warranty.
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Side by side
| Shark FlexStyle HD440BK | Revlon One-Step Volumizer | |
|---|---|---|
| Model | HD440BK (Amazon listing text: the Shark FlexStyle HD440BK Amazon listing (ASIN B0B9ZMZ65C)) | RVDR5222SDI on the Amazon listing; Revlon's page names no model number (Amazon listing text: the Revlon One-Step Volumizer Amazon listing (ASIN B01LSUQSB0); manufacturer claim: Revlon's page for the Salon One-Step Hair Dryer and Volumizer) |
| Type | dryer that twists into a styler, with interchangeable attachments (Amazon listing text: the Shark FlexStyle HD440BK Amazon listing (ASIN B0B9ZMZ65C)) | hot-air brush with a fixed (non-detachable) brush head (manufacturer claim: Revlon's page for the Salon One-Step Hair Dryer and Volumizer) |
| Power and voltage | 1,600 W; 120 V (manufacturer claim: Shark's HD440BK page) | 1100 W; made for 120 V US outlets only (manufacturer claim: Revlon's page for the Salon One-Step Hair Dryer and Volumizer) |
| Settings | 4 heat and 3 airflow settings, cool shot (listing title) (Amazon listing text: the Shark FlexStyle HD440BK Amazon listing (ASIN B0B9ZMZ65C)) | Cool, Low and High (Amazon listing text: the Revlon One-Step Volumizer Amazon listing (ASIN B01LSUQSB0)) |
| In the box | 1.25 in Auto-Wrap Curlers, Oval Brush, Paddle Brush, Curl-Defining Diffuser, Styling Concentrator (manufacturer claim: Shark's HD440BK page) | one tool with a 2.8 in oval barrel, nylon pins and tufted bristles (Amazon listing text: the Revlon One-Step Volumizer Amazon listing (ASIN B01LSUQSB0)) |
| Heat control | Shark says it measures and regulates temperature 1000 times a second (manufacturer claim: Shark's HD440BK page) | Revlon says its ceramic coating spreads heat evenly (manufacturer claim: Revlon's page for the Salon One-Step Hair Dryer and Volumizer) |
| Cord | 8 ft (manufacturer claim: Shark's HD440BK page) | not stated in the sources read |
| Hair length | not stated in the sources read | the listing says it is best for mid-length to long hair (Amazon listing text: the Revlon One-Step Volumizer Amazon listing (ASIN B01LSUQSB0)) |
| Warranty | 2-year limited warranty (manufacturer claim: Shark's HD440BK page) | 4-year limited warranty (manufacturer claim: Revlon's page for the Salon One-Step Hair Dryer and Volumizer) |
| Amazon | Amazon → | Amazon → |
Kinds of claim on this page: each cell names its sources and says whether each is product evidence (an FDA or ADA record), a manufacturer claim (the maker's own page or manual) or Amazon listing text, which is the seller's own claim. Every source was read 2026-10-11. A cell that no source read states is marked as not stated.
Each Amazon link goes to the exact model in its column: the Shark FlexStyle HD440BK (sold and shipped by Amazon.com at a US buy-box read on 2026-10-11); the Revlon One-Step Volumizer (sold and shipped by Amazon.com at a US buy-box read on 2026-10-11). No prices are shown: check the retailer for the current price, which can change often in November.
How to read this comparison
Revlon's page is for the Salon One-Step Hair Dryer and Volumizer and names no model number; the Amazon listing calls the same tool the One-Step Volumizer, model RVDR5222SDI. The page takes the power, voltage and warranty from Revlon's page by that name.
Wattage and heat-control wording are the makers' own. They do not show drying time, heat damage or the result on any hair type.
What is the difference between the Shark FlexStyle and the Revlon One-Step Volumizer?
The Shark FlexStyle HD440BK is a dryer that twists into a styler and comes with curlers, an oval brush, a paddle brush, a diffuser and a concentrator (Shark's page). The Revlon One-Step Volumizer is one hot-air brush with a fixed 2.8 in oval barrel. Shark states 1,600 W and a 2-year limited warranty; Revlon states 1100 W and a 4-year limited warranty.
More in this category: Dyson Airwrap vs Shark FlexStyle.
We tested nothing. This page compares what the sources named above say about the Shark FlexStyle HD440BK and Revlon One-Step Volumizer.