The Personal Trainer features an ergonomic shape, giving you the ultimate grip and you control the level of tightness of the lifelike textured inner channel by adjusting suction simply with your finger.Train yourself to last longer, experience intense sensations, with motion lotion for the ultimate pleasure. Life like canal and great for travelling.Real feel material is soft and warms to the touch for unique sensations that are even better than the real thing. Some like it tight, others like it loose. Whatever suction you want, Zolos air control feature adjusts for your desired tightness.