* Preserve Your Woolens and Fine Fabrics with a Safe Natural Fragrance Colibri sachets create a secure cocoon of natural fragrance which will keep wool, silk and other fine fabrics in mint condition. While preserving your clothes, Colibri with its natural formula, will also freshen them with a light natural fragrance. Colibri is an established, safe and reliable product used with success over many years. For the most effective results, it is recommended that Colibri sachets be used year round.