Why You Need Both
Outdoor cleats on indoor courts are dangerous — excessive traction causes knee injuries and damages floors. Indoor shoes on grass provide zero grip. Each surface demands specific sole construction. The difference isn't marketing — it's physics and safety.
Outdoor Cleats: FG, SG, AG
FG (Firm Ground): Molded studs for natural grass. Most versatile outdoor option. Works on dry turf too.
SG (Soft Ground): Longer, fewer, sometimes metal studs for wet/muddy natural grass. Specialized.
AG (Artificial Ground): More numerous, shorter studs specifically for artificial turf. Reduces stress on joints.
For complete cleat guide, see our soccer cleat buying guide.
Indoor Shoes: IC and Futsal
Flat, non-marking rubber sole for gymnasium/indoor court surfaces. Key features:
- Flat gum rubber sole: Maximum grip without marking floors
- Low profile: Close to ground for quick cuts
- Reinforced toe: For toe-poke shots common indoors
- Thinner upper: Better ball feel for precise touches
Turf Shoes: The Hybrid
Small rubber nubs on the sole. Work on artificial turf and some outdoor surfaces. The "third option" for players on turf fields. Also acceptable for casual indoor use (check venue rules).
Sizing Across Types
Sizing varies between FG, indoor, and turf even within the same brand. Indoor shoes often fit slightly tighter. Always try on with soccer socks. Half-size up if between sizes. Match with proper shin guards for complete setup.
When to Wear What
| Surface | Shoe Type |
|---|---|
| Natural grass (dry) | FG cleats |
| Natural grass (wet/muddy) | SG cleats |
| Artificial turf (3G/4G) | AG or TF |
| Short turf / carpet | TF |
| Indoor gymnasium | IC / indoor |
| Futsal court | IC / futsal-specific |
Top Picks
Best value combo: Get the same shoe model in FG and IC versions — identical fit, appropriate soles.
Sources & Further Reading
- Soccer Cleat Guide by Position, SoccerPro 2025.
- FIFA Surface Standards, 2025.
- Nike Football Lab Traction Study, 2024.
- adidas Football Equipment Guide, 2025.
- US Soccer Facility Standards, 2025.
