Polarn O. Pyret Pure Merino Wool Thermal Top (6 Mths-10 Yrs) - 6-8Y - Navy - Available at M&S
When the temperature drops, this Polarn O. Pyret thermal top is just the thing to keep them cosy. It's crafted from pure merino wool, which is known for its super-soft feel and natural breathability. The long sleeves and round neck make it perfect for layering under clothes on chilly days.