The Mammut Tyin MTI 5 Season is our most extreme synthetically filled sleeping bag. Designed for expedition use in the wildest environments it is designed to keep you warm even in exceptionally cold but damp conditions. This means that when used as a bivi bag, the Tyin 5 can be used without any undressing or even removing boots.
The Tyin MTI 5 Season features their Trinity Construction which packs extra insulation around the feet and head ensuring that this bag really will keep you warm in extremely cold weather. It also features Shelter TX moisture protection around the hood and foot box to further protect the insulation and so keep you comfortable. If you're after a four season sleeping bag which will cope with everything the weather can throw at you and remain warm then look no further.
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Please note: This bag does not have an EN Temperature rating as sleeping bags for extreme conditions cannot be tested by the standard. The temperature value here is based on Mammut experience.
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Outstanding performance. Camped solo for 2 nights up the Cairngorms National Park (Scotland), December 3, 4, 5, at an altitude of 1,200m, close to Ben MacDhui. Temperature of -9C, no problem. Incredible humidity (no tent, just an OR Alpine Bivy, guaranteed condensation), the Mammut is really resistant to water.
Pros: reasonably priced, Super warm, super dry, as in couldn't tell I was in a hole dug 2 feet of snow deep in the windiest place in the UK.
Cons: and also super heavy and bulky, but hey, it is a synthetic, with a down sleeping bag there is no way I could have stayed warm with all that humidity
Amazing value, really impressed. If you leave behind everything except the survival essentials, the overall weight is reasonable.
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