1. According to carrying requirements: if you need full functionality, please choose a 90cm foam roller; if you require convenient carrying, please choose a 30-60cm foam roller.
2. According to the hardness requirements: EPP material is about 50 degrees; EVA material is 38 degrees; PE material is 28-38 degrees, the larger the value, the harder.
3. According to service life: EPP has high hardness and the most durable; EVA has good elasticity; durable, and PE has the least durability.
