As ever with Icebreaker garments, there are a few distinctive quirky details – such as the reflective heat transfers also seen in the company's Outdoor collection.
"Realistically, there probably won't be many occasions when you'll be running down a trail in your briefs and someone will shine a torch on them. But if that happens, you're covered!" says Jason.
The Beast range includes four bottoms: a brief, a boxer brief with a fly, a boxer brief without a fly, and a boxer with a button fly. There's a variety of short and long-sleeved tank tops, with crew or v-necks.
Colours are classic and easy to wear: bone, grey heather/stone, and grey heather/dark. Briefs have a vibrant stripe in a salsa red, a hot gold or a bright, athletic blue.
Like all Icebreaker garments, the Beast range complies with the company's absolute insistence on sustainability and a high standard of animal welfare, as well as practices that are socially ethical, have a low impact on the environment and use the latest clean technology.