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Yes, body wave hair can be straightened with a flat iron. Remember to use a heat protector when you heat your hair.
How to Straighten Body Wave hair:
Make sure your wavy hair is clean and smooth
Before you start straightening human hair, make sure it is clean, smooth, and tangle-free. You can shampoo your body wave human hair wig, but be sure to smooth out the sewn-in wavy hair carefully with your fingers.
Straighten your body wave hairstyle properly
When you’re done prepping, you can straighten your wavy hair with a flat iron.
First, select a small section of body wave hair, then place the flat iron at the root of the section of hair and work your way down the hair.
Repeat this method (excluding the lace part) to shape the full-body wave human hair wig into straight hair.
Resoure: https://tastywig.com/hair-wig-tutorial/faqs-about-body-wave-wigs/ [tastywig.com]