Ooh La La Hair Extensions conducted trials of more than 50 clients wearing each of the following 3 methods for a period of 1 year.
Shrinkies were the preferred method of 95% of women tested. Shrinkies are the most comfortable for long term wear and puts the least amount of stress on the natural hair during the removal process. They also require the least maintenance as they stay in between 9-12 weeks and are easy to apply and remove.
Micro rings are easy to apply and remove making them the safest option if the person applying them has had no experience or training. However micro rings have an approx 10% slipping rate.
Tape is easy to apply and remove for the experienced technician however they only stay in for 4-6 weeks and therefore are require the most maintenance and are the most expensive in long term periods. Tape have a 30% slipping rate after the first use and are rated as the most damaging method.