Slip-on describes entry, not adjustment
The listed size 11 selection is useful, but no width or model code is supplied. Establish whether the opening holds the instep comfortably once the shoe is on. A shoe that is easy to enter only because it is too large may move forward during stops, placing the toes against the cap.
Do not convert puncture-proof into a guarantee
If sole-puncture protection is required, ask for the applicable marking and exact product documentation. The title alone cannot establish resistance to every sharp object. The all-black appearance and walking-sneaker wording may suit a uniform preference, but neither confirms outsole suitability for a particular floor. Compare this listing with a documented slip-on alternative before deciding that fewer fastenings solve the whole purchase.