Outdoor Arena || Indoor Arena || Outdoor Training Pens || Paddocks || Aisles
 Outdoor/Covered Arena:   (click on brand name for more information)
Arena Base: ProEquus™ OT40 perforated flexible PVC structural mats - only for equitation, S/J, dressage, etc..
Footing - sand type specified: correctly sized and blended silica sand (99.4% purity, naturally occurring Si02)
Footing - sand additive specified: Perfect Footing Orion (Customizable Hunter/Jumper premium blend).

 Indoor/Enclosed Arena:
Arena Base Options:
ProEquus™ OT40 perforated flexible PVC structural mats - for equitation & dressage.
ProEquus™ WE40 perforated flexible PVC structural mats - for multi-use arena (including Western styles).
Footing - sand type specified:
Lazy R™ Classical Equitation Sand - correctly sized and blended aggregate of silica sand (+99% Si02); appropriate for classical equitation such as: dressage, show jumping, three day eventing.
Lazy R Western Roping and Reining Sand - appropriate for FEI-Reining or NRHA approved international or national competition arenas.
Non-Quartz, less appropriate sand type options:
Ravensdale, Washington sand
Local Sand Quarry sand - "bunker sand" or "mason sand," "binders" or "minus" and a multitude of other local names, all are often/commonly misapplied for equestrian arena footing.
A.k.a.: "whatever the local sand quarry tries to sell horse owners"
NOTE: the use of these low-quality sands will void all warrantees concerning lifespan of the finished contructed arena.
Reason: the products will outlast these low-quality sands considerably, rendering the arena unusable due to:
dust,
high-compaction,
unsafe footing due to decomposition of the sand + resultant "deadening" and compaction,
and so forth.  
All the above will inevitably result from using a low-quality sand, with high-quality products.  
Think of ... "putting used engine oil in the gas tank of a Formula 1 racing machine."
Footing - sand additive specified:
Perfect Footing™ - Orion Premium Hunter/Jumper Blend (Customized for Hunter/Jumper, Showjumping, 3-Day Eventing, etc.).
 Outdoor training pens:  ~ "Square Roundpen" (training pen) Options ~
Base options:
HoofGrid™, HoofGrid HD™ or HoofGrid-40™
ProEquus™ OT40 perforated flexible PVC structural mats - for equitation & dressage.
ProEquus™ WE40 perforated flexible PVC structural mats - for multi-use arena (including Western styles).
Footing - sand type specified: to be determined (dependent upon the intended usage of these roundpens):
Sand type 1 :|:   Highly dust-resistant silica sand (Si02), with appropriate size-grading/blending (mined and graded).
Sand type 2 :|:  "somewhat" dust-resistant blend of silica sand (Si02) and other mineral types.
Sand type 3 :|: "much less" dust-resistant aggregate locally known as "bunker sand" - consisting largely of non-silica sand, such as granite, shale and other mineral types.
Footing - sand additive: (if required) to be determined (Perfect Footing Orion or Pegasus blends)
 Paddocks, turnouts, and other outdoor  non-performance areas:
Base: HoofGrid™, HoofGrid HD™ or HoofGrid-40™
 Indoor aisleways or other indoor/outdoor non-riding areas:
Base options: to be determined (either concrete or compacted/leveled gravel - dependent upon requirements of the type/brand/size of surface materials selected)
Surface options: (client specified "I-Brick" to GC)
Advised flooring systems: (for almost 40 years - the original German/Austrian equestriawn rubber pavers)
KRAIBURG Relastec® equine H-Steine paving bricks (German, shape AKA "I-Bricks" in the UK and USA).
Alternative:
Eco-Flex™ Z-Brick Pavers (Canadian MFG, popular in the UK for equine facilities)
NOTE:
Unfortunately this Canadian manufacturer discontinued their popular "I-Brick Pavers" shape, which was previously in popular demand.
Reason: due to the proliferation of the Asian-manufactured import "dogbone shape" bricks (same shape, an exact knockoff of the Kraiburg shape known as "h steine" in German and "I-Brick" in English-speaking countries.
Equestrian customers could not tell the difference - upon their casual inspection,
hence bought the cheap Asian knockoffs instead.  
The actual cost of using any Asian rubber pavers comes a few months later - when they decay and must be replaced.

Not advised flooring systems - this is up to you:
FlexGuard™ "Dogbone" paving bricks (Chinese import, "smooth surface" :|: shape aka "I-Brick" or "H-Brick")
Others "I-bricks" available (there are thousands of suppliers, from hundreds of manufacturers worldwide, sold by vendors under a multitude or rapidly changing "brands")
NOTE: we would not warrant - or rely upon any warranty or guarantee - for any product which is manufactured in Asia, regardless of the manufacturer's and/or vendor's claims or printed guarantees.  
There are no quality control or environmental/toxicity controls in place, and the actual manufacturing facility is commonly switched quickly and without notice to the customer. You end up getting the same "brand" - but the product you receive may be anything ....
Effect: you never know what you will get, what it is made out of, who made it, and what will happen after the check has cleared and the horses start walking on it.