These stretchable leggings including elastic waistband are great to wear underneath trousers or skirts. Their innovative Trevira Bioactive material with silver ions and antimicrobial silver fibres is breathable and robust. Material: 85% polyester and 15% elastane. Fibre/Yarn contains a Biocidal Product. Contains “silver sodium zirconium hydrogenphosphate – CAS-# 7440-22-4” and "silver sodium zirconium hydrogenphosphate - CAS-# 265647-11-8" built into the fiber polymer to counter the settlement and growth of micro-organisms and the development of odour in/on the treated.