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An incredibly light, versatile sleeping bag that packs down to a compact size making it ideal for cycle touring and backpacking during Spring and Summer.
An incredibly light, versatile sleeping bag that packs down to a compact size making it ideal for cycle touring and backpacking during Spring and Summer.
Mountain Equipment

Mountain Equipment Helium 400 Sleeping Bag - Regular - Left Zip

£225.00  £250.00  10% off
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With Pre-Order, you can purchase the latest items added to our store in advance of them arriving with us.

Your Pre-Order is prioritised (at no additional charge); meaning that as soon as the product arrives with us, we can wrap it straight back up; ready for collection via Click & Collect or despatch to you — it often never even hits the stock room shelves!

Pre-Launch

With Pre-Launch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Pre-Orders.

So, instead, you can submit your email address against the item you are interested in and we will email you as soon as stock arrives on the system.

Estimated Delivery & Collection Dates

Estimated Delivery & Collection Dates are given on Pre-Order and Pre-Launch products. They are for indication purposes only and can change at any time without notice.

The dates we provide are based on indications given by our suppliers. Whenever we get updated information from our suppliers we will endeavour to update the Estimated Delivery & Collection Dates provided on product pages.

We estimate this will be ready for despatch to you or collection via Click & Collect on the Undetermined
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FREE UK Returns

You can now return any purchase within 30 days Free of Charge with our simple Royal Mail returns process.


Returns Information:

  • Returns are FREE for UK customers.
  • 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 by this service will be refunded unless faulty or shipped in error.
  • If you wish to exchange an item for any reason, please place a new order for the items that you want.
  • Please note that it is your responsibility to pay for the return postage costs if you live outside of the UK, no postage costs are refundable.
  • 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.
  • 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.
  • For health and safety reasons face masks cannot be returned for an exchange or refund.
  • Climbing & PPE Safety Equipment can only be returned on very strict condition. Everything must be exactly as it was received, with packaging and labelling intact. If there is any sign or possibility that the goods have been used or contaminated then we regret that we are unable to accept a return on the grounds of consumer safety.
  • 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.

Returns Process:
  • Returns are FREE for UK customers.
  • You can return your order for FREE via one of 10,500 Post Offices. Your item will be fully tracked on its way back to us. If you're returning a faulty item, please contact us so we may assist you.

How do I return an item?

  • Download our returns form and once complete, enclose with your return.

  • Ensure you include all tags with your return and package securely.
  • Create your FREE returns label. If you do not have access to a printer your local post office can print the label for you. If the Royal Mail website is not accessible, please try again later.


Only orders that meet the following conditions may be returned using Royal Mail Tracked Returns
  • Returned parcels must have specific dimensions no larger than 61cm L x 46cm W x 46cm D
  • Returned parcels must weigh no more than 20Kgs
  • No aerosols or combustible products
  • Do not affix the Royal Mail returns label to the product packaging (shoe boxes etc.)

Mountain Equipment Helium 400 Sleeping Bag - Regular - Left Zip Information

Season : SS21

Brand : Mountain Equipment

Code : 5064775

An incredibly light, versatile sleeping bag that packs down to a compact size making it ideal for cycle touring and backpacking during Spring and Summer.
Designed by Mountain Equipment to be one of their lightest bags the Helium 400 will pack down to a compact size yet will still loft beautifully to keep you warm.
Weighing just 38g/m2, HELIUM™ 20 uses 20 denier yarns to create a fabric that is compressible, tough, and extremely comfortable. Its densely woven construction ensures the highest levels of downproofing, wind resistance and resistance to heat loss. The new HELIUM™ 20 offers greater handfeel over previous HELIUM™ fabrics as well as reduced seam slippage, resulting in even greater durability than the previous fabric.
High-quality duck down has an actual minimum down cluster content of 90% and is Mountain Equipment DOWN CODEX approved, this means you can plug your products unique code into their website to track the source of the down in your bag.
A Trapezium 4 baffle foot piece featuring ME's unique Bulls Eye™ Technology and offset Sharks Toe™ foot that is engineered for their lightest technical sleeping bags. Its baffle construction restricts down migration whilst keeping weight and bulk to a minimum.
Finally, body heat retension is optomised by utilizing slanted box-wall baffles throughout the entire main body of the bag so that meaningful weight is removed from the bag’s structure. On the very lightest models, further weight savings are gained by the use of stitch-through baffles. The use of mid-level side-seams affords great versatility whether the bag is laid on its front or back and this is also reflected in the distribution of fill which, whilst slightly favouring the top side allows plenty of fill to remain in the underside, foot piece and hood.
When it comes to sleeping bags; Mountain Equipment really know their stuff!

Specifications:
  • HELIUM™ 20 outer shell is very light and highly breathable
  • 385g of 90-10 Pure Duck Down with a minimum fill power of 700
  • Alpine fit maximises thermal efficiency
  • Slanted Box-Wall baffles throughout
  • 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 : 860g / 30.3oz
Good Night's Sleep Temperature: -5°C/23°F
  • Comfort: 3°C/37°F
  • Comfort Limit: -3°C/27°F
  • Extreme: -19°C/-2°F
Size Guide:
  • Length Inside: 190cm
  • Max Width at Shoulders: 75cm
  • Foot Width: 50cm
  • Max User Height: 185cm
  • Total Bag Weight: 855g
  • Total Fill Weight: 385g
  • Packed Dimensions: 24x20x17cm
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!
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