Wearing thermal clothes
is one way fell runners can reduce the risk of suffering hypothermia when heading for the hills in the winter.
Writing for Grough, Ian Winterburn, a fellrunner who is also a member of the Woodhead Mountain Rescue Team, said both cold weather and exhaustion can contribute to the potentially lethal condition.
He advised: "Make sure you understand the gradual effects of cold and make allowances for windchill. Warm, dry clothing is important in staving off both immersion and exhaustion hypothermia."
Mr Winterburn noted Fell Runners Association race rules will have a minimum kit requirement, but said sometimes it makes sense to wear more than this if the weather is set to be very cold.
The dangers of hypothermia can also affect walkers, who may wear more clothes but could be on the hills for longer because they are not moving as fast.
As early as last month, a woman had to be rescued from Pendle Hill in Lancashire suffering from the condition, as her clothing was wet and she was unable to walk as she had a suspected broken ankle.