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The Mountain Equipment Helium 250 Left Zip weighs less than most bottles of water which makes it the perfect sleeping bag for those travelling light in warmer weather.
The Mountain Equipment Helium 250 Left Zip weighs less than most bottles of water which makes it the perfect sleeping bag for those travelling light in warmer weather.
Mountain Equipment

Mountain Equipment Helium 250 Sleeping Bag - Regular - Left Zip

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Online Returns Information:

  • In the event that your purchase is not suitable, for whatever reason, you have the right to return it to us.
  • Goods should be returned in new condition, unused and with their original undamaged packaging.
  • We aim to process all returns within 72 hours. This may take slightly longer at busy times of the year. We will e-mail you once your return has been processed.
  • Any items returned will be refunded unless faulty or shipped in error.
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  • Goods may be returned for a refund within 30 days of receipt.
  • You do not need to contact us to notify us of your return unless the item is faulty or is outside of our 30-day policy.
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  • In the unlikely event that your purchase develops a fault, for whatever reason, then please contact us first either by telephone or email for further instructions. In the majority of cases, any faulty goods will have to be returned to us and then forwarded on to their respective suppliers for inspection. Please be aware that this process may take several weeks in some cases. Any postage costs paid will be refunded by THE CLIMBERS SHOP if a product is deemed as faulty and still under a manufacturer's warranty.
  • If you purchased in-store please contact the relevant shop directly.

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  • Download our returns form from the link at the top of this page and once complete, enclose it with your return.
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  • If possible, please include a copy of your receipt so we can process your return/exchange quicker.
  • Goods must be packaged securely to ensure they are not damaged in transit. The responsibility and liability of the goods remain with you until we are in receipt of the goods.
  • Please send your return(s) to: Returns, Hooked on Granite Ltd, Capel Curig, Betws-y-Coed, LL24 0EN

Mountain Equipment Helium 250 Sleeping Bag - Regular - Left Zip


Brand:Mountain Equipment


The Helium 250 Left Zip is a down sleeping bag packed with technology and features that doesn’t compromise on weight, making it perfect for travelling light in warmer weather. The bag has been thermally mapped with the density of each baffle assessed and calculated to give optimal performance. This process has helped to save weight yet increase performance and warmth ratings at the same time; ME’s ‘Baffle by Baffle’ approach. Baffles have been designed so the walls increase thermal efficiency and reduce cold spots, giving a warmer night’s sleep for less weight.

This bag features the Alpine fit which is more tapered at the shoulders and feet, giving a closer cut that increases thermal efficiency and minimises weight. A continuous V-baffle has been implemented in the side zip to make the Gemini system, made with a fully integrated design that reduces cold spots while using less down, saving both weight and down.

The neck collar can easily be secured and opened with the Lode Lock magnet closure, able to be used with one hand and designed to prevent accidental opening. Easy-run dual tether cords help to tighten the neck , with 5 baffles and slightly higher volume providing excellent insulation and plenty of space. The side seams have been placed in a near-even split between the top and bottom to make it easier to get in and out, complementing the 4 baffle foot-box that helps keep feet toasty warm with its highly sophisticated construction.

Protecting all of the technology and down is a Helium 20D outer shell; breathable for the down to loft with a weight of just 38g/m2.

  • HELIUM™ 20 outer shell is very light and highly breathable
  • 254 g of 90-10 Pure Duck Down with a minimum fill power of 700
  • Alpine fit maximises thermal efficiency
  • Slanted Box-Wall baffles and Stitch-Through baffles
  • Mid-level side seams
  • 5 baffle anatomically shaped hood
  • 4 baffle anatomically shaped and offset foot-box
  • Full length Gemini™ zip baffle and integrated collar with Lode Lock™ closure
  • Supplied with waterproof roll-top stuff-sack and storage cube
  • Weight: 680g / 24oz

Good Night's Sleep Temperature: 1°C/34°F
  • Comfort: 8°C/46°F
  • Comfort Limit: 3°C/37°F
  • Extreme: -11°C/12°F
Size Guide:
  • Length Inside: 190cm
  • Max Width at Shoulders: 75cm
  • Foot Width: 50cm
  • Max User Height: 185cm
  • Total Bag Weight: 705g
  • Total Fill Weight: 254g
  • Packed Dimensions: 23x18x15cm

Buyers Guide - How to choose a sleeping bag

A good night’s sleep is key to enjoying your time in the hills and vital for physical and mental recovery. Keeping toasty while you sleep is important because your body will naturally drop in temperature during deep rest. There are a multitude of sleeping bags available out there covering a vast price range but if you choose wisely, maintain your bag and store it correctly it could very well keep you snoozing happily for 20+ years.

Choosing the right sleeping bag for you involves asking some key questions included below. To help you understand why they are important simply click through to our full buyers guide to read about the incredible technologies, science, testing and the design involved in getting you a good nights sleep....

- Synthetic or down?

- Men’s or women’s?
- What is a "season" and why do the prices vary so much?
- How do I make sense of comfort ratings?
- Why should a bag “fit” me?
- So do I get what I pay for?
- I brought a “warm” bag but I’m still cold at night.
- What about the environment?

Top tips to make the right choice:

If you can visit the shop to look at them in person this is ideal as not only does it allow you to place bags side by side to instantly see the difference in cut and loft but it also gives you the opportunity to try the bags on. Just like clothing, they are all cut differently and often come in length options so that you can get exactly the right fit for you. These days, however, travelling long distances and meeting face to face may not be quite so straightforward so we are more than happy to talk with you over the phone to discuss which sleeping bag may work best for you. We are all active users of the equipment we sell and we have all had our fair share of miserable nights, that’s why we are all happy to share our knowledge - so that you don’t have to!
Sizing Information
Alpine Fit- Slightly more tapered in the upper body and in the legs than the Mountain Fit this fit maximises thermal performance and minimises weight.

Alpine Sizing:

Women's Regular Fit
Length: 180cm
User Height: 170cm
Shoulder Width: 75cm
Foot Width: 50cm

Women's Long Fit
Length: 195cm
User Height: 185cm
Shoulder Width: 75cm
Foot Width: 50cm

Regular Fit
Length: 190cm
User Height: 185cm
Shoulder Width: 75cm
Foot Width: 50cm

Long Fit
Length: 205cm
User Height: 200cm
Shoulder Width: 75cm
Foot Width: 50cm
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  • Mountain Equipment Helium 250 Sleeping Bag - Regular - Left Zip review by James, on 08/03/2022

    Some nice features and a good price
  • Home Camping and Backpacking Camping Mountain Equipment Sleeping Bags