Polarn O. Pyret Pure Merino Wool Long Johns (4-14 Yrs) - 5-6 Y - Navy - Available at M&S

These pure merino wool long johns from Polarn O. Pyret will keep them warm and snuggly on chilly days. They're made in a regular fit, with an elasticated waist that features a touch of branding for a signature look. The neat cuffed legs ensure a comfortable and cosy feel.