G: Yes, but you'd need to customize it carefully. Here's a breakdown:

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✅ Why Under Armour Could Work

• Moisture-wicking: It reduces sweat buildup compared to bare skin or cotton.
• Compression fit: It clings tightly to the arm, offering a secure base to strap things onto.
• Breathability: Most types breathe better than leather or plastic directly on skin.

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⚠️ Challenges

• Slippage: Most UA material is smooth and stretchy—good for mobility, bad for grip. A gauntlet strapped on top may slide unless anchored well.
• Durability: Under Armour isn't designed to bear load or friction from armor—it may tear or wear down quickly if the gauntlet rubs or shifts.
• Anchor points: You can't sew or rivet directly into UA fabric easily without ruining the stretch. You’d need a separate structure for fastenings.

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🔧 Recommended Setup

1. Base layer: Wear a compression sleeve or shirt (e.g., Under Armour HeatGear or ColdGear depending on season).
2. Gripping layer: Add a rubberized strip (like silicone grip bands) where the gauntlet will sit to stop slipping.
3. Structured mounting layer:
   • Use a lightweight forearm brace or semi-rigid cuff over the UA.
   • Strap your gauntlet to this, not to the Under Armour directly.
4. Ventilation management:
   • Make the gauntlet semi-open (e.g., skeletal frame or mesh-backed if cosmetic).
   • Line inside with perforated padding or spacer mesh to avoid heat traps.

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🧪 Optional Extras

• Sew or attach hook-and-loop (Velcro) to the gauntlet and use a UA-compatible arm sleeve with matching strips (industrial-grade adhesive-backed Velcro works on hard surfaces).
• Add a moisture-absorbing strip inside the gauntlet (like a sweatband) to catch overflow.

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Bottom line:
Yes, Under Armour can be a comfortable and sweat-resistant base layer, but you need extra structural and anti-slip measures to make it viable for mounting a functional or decorative gauntlet.

G: Yes, Under Armour-style fabric (a branded form of high-performance synthetic stretch fabric, often polyester/spandex or nylon/spandex blends) does require special handling when sewing due to its stretch, slickness, and tendency to fray or pucker. Here’s a compact breakdown:

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🔧 Sewing Considerations for Under Armour Fabric

1. Needle Type

• Use a ballpoint/stretch needle (usually size 75/11 or 90/14)
  → Prevents skipped stitches and fabric damage by sliding between fibers instead of piercing them.

2. Thread

• Use polyester thread (has stretch and strength)
• Avoid cotton—it breaks easily under tension

3. Stitch Type

• Use a stretch stitch, zigzag, or serger (overlock)
  → Straight stitches will snap when the fabric stretches

4. Presser Foot & Feed

• Consider a walking foot or Teflon foot
  → Helps grip slick fabric and prevents uneven feed

5. Tension & Stabilizing

• Lower tension slightly to prevent puckering
• Use wash-away or tear-away stabilizer if the fabric is curling or bunching

6. Pinning

• Use ballpoint pins or clips
  → Sharp pins can create permanent holes

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🧪 Optional Aids

• Spray starch or temporary adhesive can help with control during sewing
• Use tissue paper or interfacing under seams to prevent stretching while sewing, then tear away

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Summary:
Yes—stretchy, slick performance fabrics like Under Armour need the right needle, stitch, and stabilizing techniques to avoid skipped stitches, broken seams, or fabric damage. Once dialed in, it’s very manageable.