Ullfrotté Original 600 gram is best  used in colder conditions or when you don’t intend to move around much. It can be worn under a wind-breaker or a water-resistant outer layer. Then it’s best to wear one of our thinner base layers underneath, such as Woolpower LITE or Ullfrotté 200, that are designed to be worn closest to the body. By wearing Woolpower directly against your skin you gain the most benefit from all the good properties that wool has.