Hi Yann.... can you post a picture of your remaining hair? You can translate this site into French by clicking the translate link on the Home page so you can read my reply more easily.
You will need to make a template to represent your thin/bald area and the shape/ contour of that area also....video tutorials here: http://www.youtube.com/results?search_qu...aking&aq=f
Pick a picture of a style which is a good / near match to the hair you used to have off this site and enclose it with your order: http://www.hairfinder.com/menshair.htm Enclose a picture of your remaining hair with the order and they will match the density. You will have to experiment with various glues and /or tapes to find the best one for your active lifestyle.... you can order supplies from many suppliers on line..Debbie carries a good range : http://www.splitendshairreplacement.com/ also have a look at Oil-resistant white glue as many wearers are having excellent bonds with it as you will read here: http://forum.toplace.com/showthread.php?tid=4600 .... http://www.coolpiece.com/products/Oil-Re...-Glue.html
Because you say you will sweat, you can order `scalp protector`from Debbie.. it creates a barrier between glue and skin and a good foundation for the glue. Also add a bottle of `knot-sealer` to your order [click the `Accessories`link on Debbie`s site] as this will help prevent hair from shedding through knots becoming undone. Just pick a style which is nearest to what you originally had ..... there are a few other French wearers on here so hopefully some of them can help you with your questions in your own language.....finally, send your template and pictures to Toplace at : Toplace USA, P.O. Box 5, Circle Pines,
MN 55014, U.S.A. Enclose your hair-sample and your e -mail address ...John will send you an invoice by e-mail and you can pay it using `Paypal`. Hope that helps.. Paul.