One Pants for your little one. They made from organic 100% merino wool fleece. VERY soft, VERY warm, just amazing longies! Merino wool is the softest wool – ideal for baby’s skin. It is natural body temperature regulator. Great design of these pants allows to regulate size. Size 3-6 mon for height 62-68 cm (24-27 inches), full length of longies 51 cm (20 inches). Size 6-12 months, for height 74-80 cm (29-31 inches), full length of longies 60 cm (23 1/2 inches). Size 12-24 months, for height 86-92 cm (34-36 inches), full length of longies 67 cm (26 1/2 inches).