How long do you heat in microwave? I just received mine but already discarded the packaging.

Microwave this heat wrap for 1 minute, flip the wrap then microwave another 30 seconds. When it is new, it can be very moist and take longer to heat up. After it is dried up, it will be a lot easier. Same with the smell of this heat wrap. The lavender smell can be strong at first. Do not exceed the total heating time of 2 minutes. It can burn. (after it is dry) We don't use any flame-retardants in the fabric. We only use safe and natural materials. Those flame-retardants can cause cancer. Be careful. We now make some of these with 100% cotton fabrics. Thanks, Sharon

What is the smell like?

Smell is like a strong lavender. Smell was almost a deal breaker. However, smell did dissapate over time. I wrenched my neck and had pain and limited range of motion for 4 months. I do credit this with my recovery.

what is the difference between the regular length one and the extra long one in inches?

This style of neck wraps has only one length. It is 26 inches. Before filling with seeds, it was 27.5 inches. The hands-free neck wrap is longer. The XL version is 30 inches long and it has an elastic band to hold the two ends together. https://www.amazon.com/Sunny-Bay-Hands-Free-Unscented-Heating/dp/B07D4ZBXZX?ref_=ast_sto_dp Thanks, Sharon

is the purple one any different?

The purple fabric is the same as the navy blue one. It is soft and has a nice stretch. It is very comfortable. Everything else is the same as other colors. Best wishes, Sharon BioMed DB Design, LLC