Hollis DX-300X Technical Expedition-Grade Drysuit w/ 5mm Neoprene Socks

Hollis | SKU: 277.3000.004

Refer & Earn

⚠️ FINAL SALE - NO REFUNDS

$2,399.95

Shipping calculated at checkout.

In stock — ships from Irvine, CA

Size

Not sure of your size? Matched to Hollis’s size chart

Pickup available at In Store

Usually ready in 2 hours

All Hollis size charts on one page. Imperial in bold, metric underneath.

Wetsuits

Hollis Neotek wetsuits

Weight and height

Size	Weight lb · kg	Height ft/in · cm
SM	135–150 61–68	5′6″–5′8″ 167–172
MD	155–170 70–77	5′8″–5′10″ 172–177
ML	165–180 74–81	5′9″–5′11″ 175–180
LG/SH	170–185 74–81	5′7″–5′9″ 170–175
LG	175–190 79–86	5′10″–6′1″ 177–182
XL/SH	185–200 81–88	5′8″–5′10″ 172–177
XL	190–205 86–92	5′11″–6′3″ 180–190
2XL	205–220 92–99	6′0″–6′3″ 182–190
3XL	230–260 104–117	6′1″–6′4″ 185–193

Chest, waist and hip

Size	Chest in · cm	Waist in · cm	Hip in · cm
SM	36–38 91–96	29–31 73–78	35–36 88–91
MD	38–40 96–101	31–33 78–83	37–39 93–99
ML	40–41 101–104	32–34 81–86	38–40 96–101
LG/SH	41–42 104–106	33–35 83–88	39–41 99–104
LG	41–42 104–106	33–35 83–88	39–41 99–104
XL/SH	42–44 106–111	35–37 88–93	41–43 104–109
XL	42–44 106–111	35–37 88–93	41–43 104–109
2XL	44–46 111–116	37–39 93–99	44–46 111–116
3XL	47–50 119–127	40–43 101–109	47–50 119–127

Drysuits

Hollis DX-300X drysuit

Weight and height

Size	Weight lb · kg	Height ft/in · cm
XS	120–145 54–66	5′3″–5′6″ 160–168
SM	135–155 61–70	5′6″–5′8″ 168–173
MD	150–175 68–80	5′7″–5′10″ 170–178
ML	170–195 77–89	5′9″–6′0″ 175–183
LG	185–210 84–96	5′10″–6′1″ 178–185
XL	210–240 96–109	5′11″–6′2″ 180–188
2XL	235–265 107–121	6′1″–6′4″ 185–193
3XL	260–295 117–134	6′2″–6′6″ 188–198

Chest, waist, hip and inseam

Size	Chest in · cm	Waist in · cm	Hip in · cm	Inseam in · cm
XS	32–36 81–91	26–30 66–76	32–36 81–91	26–28 66–71
SM	34–38 86–96	28–32 71–81	34–38 86–96	27–29 68–73
MD	37–40 94–101	30–34 76–86	35–39 89–99	28–30 71–76
ML	38–42 96–106	32–36 81–91	37–41 94–104	29–31 73–79
LG	40–44 101–112	34–38 86–96	39–43 99–109	30–32 76–81
XL	42–46 106–117	36–40 91–101	41–45 104–114	31–33 79–84
2XL	44–48 112–122	38–42 96–106	43–47 109–119	32–34 81–86
3XL	46–50 117–127	40–44 101–112	45–49 114–124	33–35 84–89

Boot size

Size	Boot size
XS	7
SM	7
MD	8
ML	9
LG	9
XL	10
2XL	11
3XL	11

Hollis men's AUG 450

Height

Size	Height ft/in · cm
XS	5′5″–5′8″ 165–172.5
SM	5′7″–5′10″ 170–178
MD	5′9″–6′0″ 175.5–183
LG	5′11″–6′2″ 180.5–188
XL	6′1″–6′4″ 185.5–193
2XL	6′3″–6′6″ 190.5–198
3XL	6′5″–6′8″ 195.5–203

Chest, waist and inseam

Size	Chest in · cm	Waist in · cm	Inseam in · cm
XS	30–34 76–86	23–27 58–68	30–31.5 76–80
SM	34–38 86–96	27–30.5 68–78	31–32.5 79–83
MD	38–41.5 96–106	30.5–34.5 78–88	32.5–34 82–86
LG	41.5–45.5 106–116	34.5–38.5 88–98	33.5–35 85–89
XL	45.5–49.5 116–126	38.5–42.5 98–108	34.5–36 88–92
2XL	49.5–53.5 126–136	42.5–46.5 108–118	36–37.5 91–95
3XL	53.5–57.5 136–146	46.5–50.5 118–128	37–38.5 94–98

Fins

Hollis F-1 fins

Size	Shoe size
REGULAR	7–9
XL	10–12
2XL	13–15

Hollis F-2 fins

Size	Shoe size
SMALL	4–6
REGULAR	7–9
XL	10–12

Source: Hollis’s size chart. Values in the second unit come from Hollis’s own chart where it prints them.

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Save with Open Box or Used Purchase

Open Box Hollis DX-300X Technical Expedition-Grade Drysuit w/ 5mm Neoprene Socks

Sale price $1,919.95 Regular price $2,399.95

Product Information

The Hollis DX-300X is an expedition-grade technical drysuit built for demanding conditions, with Nylon Cordura shell, 12-layer Butyl Mass core, and patented BIAS cut.

Who it is for

This drysuit was designed by technical divers, for technical divers, and developed over three years of testing in demanding conditions. It suits divers needing a durable, long-wearing suit for expedition diving in demanding conditions where leak resistance, range of motion and reliable seals matter.

Key details

The shell and liner combination delivers warmth, mobility, and durability at an overall material weight of 700 g per square unit, with a tear strength that exceeds 300 N. The suit uses a YKK low-profile zipper and user-replaceable SiTech silicone neck and wrist seals, along with a chest-mounted inflator valve and a shoulder-mounted exhaust valve for buoyancy control. Wide flat seam construction reduces high-risk leak areas, and the suit includes 3M reflective safety strips.

Outer shell: heavy-duty Nylon Cordura
Core: 12-layer Butyl Mass
Inner liner: silk weave polyester
Kneepads: double-thickness 5mm neoprene
Socks: 5mm neoprene
Pockets: two large Velcro thigh pockets with 2 inch D-rings
Suspenders: adjustable

Compatibility and sizing

The DX-300X is available in XS, S, M, ML, L, XL, 2XL, and 3XL. Adjustable suspenders help tailor the fit across these sizes for a range of body types and layering needs.

DiveCatalog.com is an authorized Hollis dealer and a dive shop in Irvine, California, serving divers since 2003. Call 888-701-4017 or chat with us if you have questions about sizing, seal fit, or compatibility with your current gear.

⚠️ WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.

Frequently Asked Questions

How much does a drysuit cost?

Drysuit cost varies based on brand, materials, and technical features, and the DX-300X is positioned as an expedition-grade suit built with premium materials like a Nylon Cordura shell and a 12-layer Butyl Mass core. For current availability and fit guidance on this model, call DiveCatalog.com at 888-701-4017 or start a chat with the team.

What sizes does the Hollis DX-300X come in?

The DX-300X is offered in XS, S, M, ML, L, XL, 2XL, and 3XL. The suit also includes adjustable suspenders so divers can fine-tune the fit across different body types and base layer thicknesses within each size.

Can I replace the neck and wrist seals on the DX-300X myself?

Yes. The DX-300X uses SiTech silicone neck and wrist seals that are designed to be user-replaceable, so divers can swap damaged or worn seals without sending the suit to a repair center, keeping the drysuit mission-ready for expedition diving.

What kind of inflator and exhaust valves does the DX-300X use?

The DX-300X is equipped with a chest-mounted inflator valve and a shoulder-mounted exhaust valve, giving divers standard buoyancy control placement that is common on technical expedition drysuits for easy reach during a dive.

5 stars: 4 (100%)
4 stars: 0 (0%)
3 stars: 0 (0%)
2 stars: 0 (0%)
1 star: 0 (0%)

So far so good

So far so good. The suit fits really well. Is very comfortable.
Don't make a stupid mistake that I did, make sure you look in the tech pockets for all the paperwork on the suit. I did not look in the pockets so all the paperwork went with me on my first dive with a suit🤪

I have owned ma...

I have owned many drysuits in the past. I originally picked up this one to be a back-up/traveling suit but I think this is now my goto drysuit. It is light and comfortable, easy to get on. The zipper is fantastic. It glides easily and has a low profile so it is less likely to catch on harnesses and accessories. The new oval wrist cuffs make getting my big hands in and out a breeze while still reducung the overall girth of the cuff. I am a big fan of silicone seals as well. I think Hollis really has a winner here.

I have owned ma...

Hands down the ...

Hands down the MOST comfortable dry suit I have worn (in and out of the water)! All in all the suit has some amazing features that make it an excellent buy:

Sizing chart

DiveCatalog.com

Hi,

Thank you for reaching out to us! We appreciate your inquiry and value your business.

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+1 (888)-701-4017

Brand	Hollis
Model	DX-300X
Suit Type	Technical expedition-grade drysuit
Outer Shell	Nylon Cordura
Core	12-layer Butyl Mass
Inner Liner	Silk weave polyester
Overall Material Weight	700 g/sq.
Tear Strength	Exceeds 300 N
Cut	Patented BIAS cut with telescopic torso
Zipper	YKK, low-profile, flexible design
Neck Seal	SiTech silicone, user-replaceable
Wrist Seals	SiTech silicone, user-replaceable
Inflator Valve	Chest-mounted
Exhaust Valve	Shoulder-mounted
Pockets	Two large hook-and-loop thigh pockets with 2 inch D-rings
Knees	Double-thickness 5mm neoprene kneepads
Socks	5mm neoprene
Suspenders	Adjustable
Reflective Safety	3M reflective strips
Sizes Available	XS, S, M, ML, L, XL, 2XL, 3XL