Weft Hair Extension Training Course Now Open | Weekly St. Catharines Training | Ontario Wide Workshops Weft extensions pair sewing with braiding to add length and volume. This course is available for $599 in St. Catharines. Specialized hair extension courses are also available including advanced hair extensions, braid in extensions, weave hair extensions, tape in hair extensions, nanoring hair extensions and microlink hair extensions. For any questions regarding hair extension installment or training, contact us at estheticiansinc@gmail.com. Starter kits available.