"Richard Tremelling was sacked for taking his GCSE class on to a snowy playing field and allowing two of them to have a ride on the 30-year-old "design classic" Scandinavian racing sledge.
Presenting the case at the hearing in Cardiff, Rosa Fernandes said: "Mr Tremelling took the sledge to school without the authorisation of the headteacher.
"He used the sledge on snow-covered slopes at the rear of the school and allowed two pupils to use it. He failed to carry out appropriate risk assessments and failed to provide a written risk assessment. He didn't ensure pupils were wearing protective headgear and protective clothing."
The two boys who went sledging were unharmed in the 10-minute episode at Cefn Hengoed community school in Swansea.
During the hearing, Tremelling explained how he discussed the manufacture and use of the sledge with pupils during a revision class. He said: "A number of pupils stayed behind interested and excited. They wanted to see it in use and, giving it some thought, I agreed. I took the sledge and pupils to the back of the building where there was two to three inches of snow."
Tremelling said he conducted a "mental risk-assessment" before sliding down a small slope himself on the sledge. Two of the pupils, both 15, volunteered to ride the sledge, one after the other. He said: "The whole process took less than 10 minutes and I was sure it reinforced their knowledge."
Tremelling said he now hoped to get back to teaching as soon as possible, having worked in the Territorial Army following his dismissal from the school.
Colin Adkins, of the teaching union NASUWT, said: "Mr Tremelling was just trying to do his job and research shows children learn best when they're engaged and enthused.
"He conducted his lesson with the best interests of the children in mind. Teachers are often the victims of an over-precautious environment."
Perhaps he ought to have wrapped them totally in bubble wrap, as well.
