The ASICS GEL-CUMULUS 25 (M) in the Illusion Blue/ Glow Yellow colorway is a popular running shoe known for its comfort, support, and performance. 

Specifications:

1. Cushioning: The GEL-CUMULUS 25 features GEL technology cushioning in the heel for excellent shock absorption, making it ideal for long-distance running.
2. Midsole: It includes FLYTEFOAM and FLYTEFOAM Propel technologies in the midsole, which provide lightweight and responsive cushioning.
3. Upper: The engineered mesh upper enhances breathability and provides a secure fit, ensuring comfort throughout the run.
4. Outsole: The AHAR (ASICS High Abrasion Rubber) outsole increases durability, particularly in high-wear areas.
5. Fit: The shoe has an Ortholite X-40 sockliner for additional comfort and moisture management.

These features make the ASICS GEL-CUMULUS 25 a versatile choice for runners of various levels, offering a balance of comfort, support, and durability.