Biotherm blue therapy day night duo set draws inspiration from the acean with algae rich formulas the refresher that your skincare routine needs providing a deep sense of well being upon application your skin is visibly repaired texture is improved while the appearance of fine lines and wrinkles is visibly reduced the day cream works to protect your skin against uv and uvb rays with a built in spf15 that also helps to prevent premature ageing the night cream repairs your skin during