Hollis M4 Mask
The Hollis M4 offers a straightforward single-window mask with a compact frameless body and silicone skirt. Its low-volume shape suits divers who prefer a close-fitting mask without a central lens divider. An adjustable strap helps you settle the seal comfortably, and the supplied protective box keeps the mask safe in your dive bag between outings.
Features and benefits
- Single-window view: Provides an uninterrupted viewing area ahead.
- Frameless construction: Avoids a bulky external frame and packs compactly.
- Silicone sealing skirt: Flexes around your face when the skirt shape fits correctly.
- Adjustable mask strap: Lets you set light, comfortable tension.
- Protective mask box: Keeps the lens and skirt protected during transport.
Size and fit
Our catalogue places the M4 in the large-face group. Check the individual seal and bridge clearance before choosing it.
Keep hair clear of the sealing edge and hold the mask gently against your face. Check even contact at the cheeks and forehead, plus comfortable access to your nose. Use light strap tension; overtightening can distort the skirt rather than correct the wrong shape. If you wear a hood, check the fit with it in place.
What’s included
One Hollis M4 mask with fitted adjustable strap and protective mask box.
Technical Specs
| Brand | Hollis |
|---|---|
| Model | Hollis M4 |
| Face fit guide | Large Face |
| Lens layout | Single lens |
| Frame type | Frameless |
| Frame material | Silicone body; no separate rigid frame |
| Skirt material | Silicone |
| Strap type | Adjustable |
| Internal volume | Low volume |
| Lens material | Not specified in the checked exact-model information |
| Strap material | Not specified in the checked exact-model information |
| Country of manufacture | Not specified in the checked exact-model information |
| Included | One Hollis M4 mask with fitted adjustable strap and protective mask box. |
Care and storage
Rinse the mask in fresh water after every outing, flushing salt and grit from the skirt, strap and buckles. Use mild liquid soap only where the mask manufacturer allows it, then rinse thoroughly. Dry in the shade and store with the lens protected and the skirt relaxed. Check the strap and sealing edge before use. Avoid abrasives, toothpaste and flame treatments.
For standard uncoated mask glass, TUSA TEC52 anti-fog treatment is an option when used according to the mask and treatment instructions. Confirm compatibility before applying any cleaner or defogger to a prescription lens, coating or anti-fog film.
For a separate neoprene strap cover, if you use one, we recommend Cressi Neoclean Wetsuit Wash or Revivex Wetsuit Shampoo to clean compatible neoprene. Wash that component separately according to its care label and the cleaner’s dilution instructions, then rinse thoroughly and dry in the shade. These neoprene cleaners are not a recommendation for the mask lens or a regulator assembly.
Compare more diving masks or contact our Hallam team for help choosing the right fit.


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