The standard taovala, for formal and semi-formal wear, is a short mat coming halfway up the thighs. It is wrapped around the waist and tied with a "kafa", a traditional rope often made of woven coconut coir or human hair belonging to a deceased ancestor. The mat worn on festive occasions, such as to one's own wedding, is much larger, finely woven and often very nicely decorated. This fine variant of ta'ovala is known as the "ngafingafi", and corresponds to the 'Ie Tōga of the Samoans. The value of individual "ngafingafi" is determined by its colour, which may range from bleached white to a rich shade of tan or even coffee, depending on its age; the darker the colour, the greater the age, and the higher the value and prestige of the fine mat. Likewise the taovala for a funeral is also a huge mat, but much coarser and undecorated, woven from the rougher side of the pandanus leaf. If the wearer is of an inferior rank to the deceased, then the mat to be donned would be old, well-worn and tied in such a way as to wrap around the upper body and veil the head. The older and more torn it is, the better. All these special mats are kept as precious heirlooms.