Machine weft is attached using Microlinks. Lays much flatter without the bulk of conrows. Needs to be tightened periodically, hair can be re-used. Aside from making hair longer,fuller or both a bad hair cut can be remedied instantly .Middle stage of growing out can be avioded .If you’re always trying to get more fullness,washing every day to get volume -you can put an end to this and not have to continual styling stress your hair.Some believe hair extensions are high maintainence ,but in reality they can actually save a lot of people time otherwise spend styling .If extensions are installed incorrectly ,it could cause damage . If they aren’t cared for ,or are left in too long extensions could cause damage .Be careful buying your own hair,cheaper hair can tangle with itself and your hair.