We bought these kneepads, so that the pants do not wear through so quickly when our crawlers inside. When crawling aid we do not need it, because the two are well on smooth floors on her knees go. The kneepads ansich are well made, unfortunately the material used is not very high. Even after washing (30 ° C delicates) hung sporadically out the threads. After a wearing day, the rubber studs looked very battered and the material was very fuzzy. When wearing the saver slide again under the knees or roll up the upper collar forth, so that they often have to pull back in the day. Our girls are very slim (85 cm and 8.5 kg) and have totzdem through the elastic waistband bruises on his leg. I can imagine that the saver constrict stronger children / babies legs properly.
Conclusion: definitely try. Unfortunately, there are not a wide selection of savers. But do not expect too much from life. I myself do not buy them again.