Clothes and glasses
"We recommend decent cross-country socks that are not too warm, but not too cold either. With them, windstopper trousers and for cold days, padded outer trousers are very practical. You should wear a functional shirt under the insulation jacket with wind stopper function. What I also find very practical is a scarf. When it's very cold, I pull it over my nose and breathe through it. For the ears, you need a functional headband or cap. Sunglasses that aren't too dark for the play of light and shadow make for a good view."