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A sleeping bag’s draught collar is an insulated section around the upper body or neck area that helps reduce warm air escaping from the bag. It is different from the hood and the insulated baffle alongside the zip. Knowing which part does what makes adjustment easier on a cool night.
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Distinguish the collar, hood and zip baffle
The hood shapes insulation around the head while leaving the face clear. The collar sits lower, around the opening above the shoulders. A zip baffle follows the zip to reduce the poorly insulated gap along that closure.
Manufacturers use different terms and constructions, so look at the actual design rather than assuming every bag has all three. A rectangular summer bag and a shaped cold-weather bag may offer very different ways to control the opening.
Adjust gently in your sleeping position
Lie down in the bag and follow its instructions for setting the collar. The aim is a comfortable fit that limits open gaps, not a tight cord around your neck. Keep breathing unobstructed and make sure you can loosen the adjustment easily.
Try turning onto your side. Check whether toggles or cord locks press against your body and whether the collar remains comfortable. Avoid making the first adjustment in darkness when you have not yet learned the controls.
A current product example
The current Rab Ascent −6°C includes a synthetic-insulated collar and an adjustable hood. You can check the current Ascent listing on Amazon UK. Use the maker’s description for the exact model; retailer text can combine features from related versions.
The presence of a collar is a feature to inspect, not a standalone warmth rating. Compare the bag’s temperature guidance, fit and overall construction rather than assuming any collar makes it suitable for winter.
Know when to open the bag instead
If you are too warm, use the permitted ventilation options rather than keeping every adjustment closed simply because the collar exists. Loosening the collar, adjusting the hood or opening part of a two-way zip can offer different amounts of ventilation, depending on the design.
Make changes while keeping bedding dry and the face clear. Do not cover your head with the entire bag as a substitute for using the hood correctly.
Check fit before blaming the collar
A bag that is too short or narrow may pull the upper opening into an awkward position. A pillow placed partly inside the hood can also change the fit. Test the complete mat, pillow and bag arrangement before deciding that a particular adjustment does not work.
Keep the collar clean and inspect its seams and adjustment system during normal care. If it is damaged, follow the manufacturer’s repair advice rather than removing or modifying it casually.
A well-used collar is one part of controlling warmth comfortably. It works alongside suitable insulation, a correctly fitted bag and a mat chosen for the expected conditions.
Continue with our sleeping bag buying guide.
Reviewed 10 September 2026. This guide is based on published specifications and guidance.