First of all, let’s first understand the size of the wig cap. Usually the size of the wig cap refers to the inner circumference of the wig cap, from the front hairline to behind the ears, to the nape of the neck, and to the circumference on the other side. Basically, wig caps are available in three sizes: Small, 21.5 inches, Medium, 22.5 inches, and Large, 23.5 inches or larger. Average medium size fits most people. Therefore, most wigs are mainly manufactured in medium sizes.
Here we'll cover three basic tips on how to resize your wig cap.
1. Use adjustable shoulder straps

2. Use a headband

3. Use elastic bands
We highly recommend this method as it is more invisible and gives you a more natural look. Braid it into the back of the wig first, it's better to sew two pieces at a time. Afterwards, you can use this band to adjust the size freely, and it can also help you achieve the look of a glue-free wig if you use it for a lace front wig.These three methods are very useful for adjusting the wig cap size, especially for small heads. If you need a large head size wig, now we also support customizing large cap size wigs, 13*4 lace forehead wig and 4*4 lace closure wig. If you have any questions, please feel free to contact us.