The Pinnacle Austra Chelsea Safety Boots (STC, SMS) it is a safety footwear designed to provide comfort, flexibility, stability, and protection for the wearer. Here are the key features and benefits mentioned in your description:

1. NRCS Approved: The boots are approved by the National Regulator for Compulsory Specifications, indicating they meet certain safety and quality standards.
2. Comfort, Flexibility, and Stability: The boots are designed to offer comfort during wear, along with flexibility and stability to support various activities.
3. Anti-Static and Non-Woven Inner Sock: The boots feature an anti-static property, which can help prevent static buildup and discharge. The non-woven inner sock likely contributes to the overall comfort of the boots.
4. Full-Grain Leather: The boots are manufactured using full-grain leather, which is a high-quality type of leather known for its durability and natural appearance.
5. Elastic Side Gussets: Elastic side gussets provide flexibility and ease of entering and exiting the boots. These gussets allow the boots to stretch slightly for a more comfortable fit.
6. Pull Straps: The added pull straps help with putting on and taking off the boots, making the process more convenient.
7. Vamp Lining: The lining in the vamp area (front part) of the boots is designed to absorb perspiration, helping to keep the feet dry and comfortable.
8. Mid-Sole Shank: The mid-sole shank is a supportive structure placed within the midsole of the boots. It provides arch support, which can be beneficial for individuals who need extra support for their feet.
9. Steel Midsole Plate and Steel Toe Cap: The boots feature both a steel midsole plate and a steel toe cap. These components provide protection against punctures and impact hazards, respectively.
10. Size Range: The boots are available in sizes 4-12, catering to a wide range of foot sizes.