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Emergency services had to be called to the summit of Snowdon after a teenager climbed Wales' tallest mountain in only his underwear.

An ambulance crew was called to treat 19-year-old Nathan French when he finished the 1085 metre climb after becoming unwell at the summit.

Medical attention was needed after his blood sugar and blood pressure dropped.

However the teenager has no regrets over the bizarre challenge - which nearly left him in hospital - because the “stupid” stunt was all to raise money for charity.

(Image: Handout)

Nathan, from Halewood, Liverpool, told the Echo: “For a while I have wanted to do something to raise money for Dementia UK.

“My nan has dementia so it is something that is close to my heart.

“However the people that know me will know I always like to do something with a bit of a twist and something a bit fun - so that’s how I decided to do the climb in Superman underwear.

Climbing advice website Snowdon Mountain Guides recommends people wear “extra warm clothing” as weather conditions become particularly cold as the air pressure drops.

(Image: Handout)

The mountain, which stands at 1085 metres tall, is the highest in Wales and is a popular tourist attraction.

Nathan, who is studying sport, nutrition and health at university, said: “This is the first time I have ever climbed a mountain like this.

“I keep fit and I am always in the gym but this was different.

“It was very cold and it got progressively colder the higher up we got.

(Image: Handout)

“The hardest part, and when I really started to struggle, was when I reached the top, but my dad, who did it with me, was behind me and I had to stop and wait for him.

“That was a very long and cold five minutes waiting for him.

“I couldn’t physically stop shaking and we had to ring an ambulance, who saw to me when I got back down.”

(Image: Handout)

Nathan who raised £950 for charity from the climb last Saturday, added: “The paramedic obviously said I was very silly but he understood why I had done it when I said it was for charity.

“It was very emotional completing it and I cried at the top because it does mean a lot to raise this money.

“It is hard to raise awareness of dementia but I am just going to do what I can to raise money to try and help those with this terrible illness.”